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PYSEC-2020-149
Vulnerability from pysec - Published: 2020-03-06 20:15 - Updated: 2020-03-09 16:55
VLAI
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Impacted products
| Name | purl | urllib3 | pkg:pypi/urllib3 |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "urllib3",
"purl": "pkg:pypi/urllib3"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "a74c9cfbaed9f811e7563cfc3dce894928e0221a"
}
],
"repo": "https://github.com/urllib3/urllib3",
"type": "GIT"
},
{
"events": [
{
"introduced": "1.25.2"
},
{
"fixed": "1.25.8"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.25.2",
"1.25.3",
"1.25.4",
"1.25.5",
"1.25.6",
"1.25.7"
]
}
],
"aliases": [
"CVE-2020-7212",
"GHSA-hmv2-79q8-fv6g"
],
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "PYSEC-2020-149",
"modified": "2020-03-09T16:55:00Z",
"published": "2020-03-06T20:15:00Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/urllib3/1.25.8/"
},
{
"type": "FIX",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
}
]
}
BREW-BZT-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:38 – Updated: 2026-10-10 10:31 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "bzt",
"purl": "pkg:brew/bzt"
},
"ranges": [
{
"events": [
{
"introduced": "1.13.7"
},
{
"fixed": "1.14.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-bzt-CVE-2020-7212",
"modified": "2026-10-10T10:31:28Z",
"published": "2026-08-13T16:38:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-CERTBOT-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:39 – Updated: 2026-10-08 00:43 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "certbot",
"purl": "pkg:brew/certbot"
},
"ranges": [
{
"events": [
{
"introduced": "0.36.0"
},
{
"fixed": "1.1.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-certbot-CVE-2020-7212",
"modified": "2026-10-08T00:43:34Z",
"published": "2026-08-13T16:39:03Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-CHARM-TOOLS-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:39 – Updated: 2026-10-07 22:51 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "charm-tools",
"purl": "pkg:brew/charm-tools"
},
"ranges": [
{
"events": [
{
"introduced": "2.7.2"
},
{
"fixed": "2.7.3"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-charm-tools-CVE-2020-7212",
"modified": "2026-10-07T22:51:09Z",
"published": "2026-08-13T16:39:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-CONAN-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:41 – Updated: 2026-10-01 08:56 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "conan",
"purl": "pkg:brew/conan"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.31.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-conan-CVE-2020-7212",
"modified": "2026-10-01T08:56:09Z",
"published": "2026-08-13T16:41:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-COOKIECUTTER-CVE-20… (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:41 – Updated: 2026-10-07 22:45 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "cookiecutter",
"purl": "pkg:brew/cookiecutter"
},
"ranges": [
{
"events": [
{
"introduced": "1.7.0"
},
{
"fixed": "1.7.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-cookiecutter-CVE-2020-7212",
"modified": "2026-10-07T22:45:50Z",
"published": "2026-08-13T16:41:06Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-CREDSTASH-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:41 – Updated: 2026-10-08 00:56 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "credstash",
"purl": "pkg:brew/credstash"
},
"ranges": [
{
"events": [
{
"introduced": "1.16.0"
},
{
"fixed": "1.16.2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-credstash-CVE-2020-7212",
"modified": "2026-10-08T00:56:49Z",
"published": "2026-08-13T16:41:15Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-DNSTWIST-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:43 – Updated: 2026-10-07 23:28 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "dnstwist",
"purl": "pkg:brew/dnstwist"
},
"ranges": [
{
"events": [
{
"introduced": "20190706"
},
{
"fixed": "20190706_2"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-dnstwist-CVE-2020-7212",
"modified": "2026-10-07T23:28:11Z",
"published": "2026-08-13T16:43:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-DOCKER-SQUASH-CVE-2… (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:43 – Updated: 2026-10-08 01:21 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "docker-squash",
"purl": "pkg:brew/docker-squash"
},
"ranges": [
{
"events": [
{
"introduced": "1.0.8_1"
},
{
"fixed": "1.0.9"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-docker-squash-CVE-2020-7212",
"modified": "2026-10-08T01:21:20Z",
"published": "2026-08-13T16:43:20Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-DUPLICITY-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:44 – Updated: 2026-10-07 22:45 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.8.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "duplicity",
"purl": "pkg:brew/duplicity"
},
"ranges": [
{
"events": [
{
"introduced": "0.8.05_1"
},
{
"fixed": "0.8.11.1596"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.8.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.8.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-duplicity-CVE-2020-7212",
"modified": "2026-10-07T22:45:03Z",
"published": "2026-08-13T16:44:03Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
BREW-DXPY-CVE-2020-7212 (GHSA-HMV2-79Q8-FV6G)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:44 – Updated: 2026-10-08 01:04 – Source website
VLAI
Summary
Uncontrolled Resource Consumption in urllib3
Details
The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
Severity
References
| URL | Type | ||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "urllib3",
"resource_purl": "pkg:pypi/urllib3@2.7.0",
"upstream_fixed_in": "1.25.8"
},
"package": {
"ecosystem": "Homebrew",
"name": "dxpy",
"purl": "pkg:brew/dxpy"
},
"ranges": [
{
"events": [
{
"introduced": "0.289.1"
},
{
"fixed": "0.290.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/urllib3@2.7.0",
"name": "urllib3",
"resource": "urllib3",
"strategy": "registry",
"subject_version": "2.7.0"
}
]
},
"details": "The _encode_invalid_chars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).",
"id": "BREW-dxpy-CVE-2020-7212",
"modified": "2026-10-08T01:04:12Z",
"published": "2026-08-13T16:44:51Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-7212"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-hmv2-79q8-fv6g"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml"
},
{
"type": "PACKAGE",
"url": "https://github.com/urllib3/urllib3"
},
{
"type": "WEB",
"url": "https://github.com/urllib3/urllib3/blob/master/CHANGES.rst"
},
{
"type": "WEB",
"url": "https://pypi.org/project/urllib3/1.25.8"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Uncontrolled Resource Consumption in urllib3",
"upstream": [
"GHSA-hmv2-79q8-fv6g",
"CVE-2020-7212",
"PYSEC-2020-149"
]
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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