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PYSEC-2021-421
Vulnerability from pysec - Published: 2021-10-20 21:15 - Updated: 2021-11-16 03:58
VLAI
Details
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Impacted products
| Name | purl | babel | pkg:pypi/babel |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "babel",
"purl": "pkg:pypi/babel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.8",
"0.8.1",
"0.9",
"0.9.1",
"0.9.2",
"0.9.3",
"0.9.4",
"0.9.5",
"0.9.6",
"1.0",
"1.1",
"1.2",
"1.3",
"2.0",
"2.1.1",
"2.2.0",
"2.3.0",
"2.3.1",
"2.3.2",
"2.3.3",
"2.3.4",
"2.4.0",
"2.5.0",
"2.5.1",
"2.5.2",
"2.5.3",
"2.6.0",
"2.7.0",
"2.8.0",
"2.8.1",
"2.9.0"
]
}
],
"aliases": [
"CVE-2021-42771",
"GHSA-h4m5-qpfp-3mpv"
],
"details": "Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.",
"id": "PYSEC-2021-421",
"modified": "2021-11-16T03:58:43.401152Z",
"published": "2021-10-20T21:15:00Z",
"references": [
{
"type": "WEB",
"url": "https://www.tenable.com/security/research/tra-2021-14"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-h4m5-qpfp-3mpv"
}
]
}
BREW-CSVKIT-CVE-2021-42771 (GHSA-H4M5-QPFP-3MPV)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:41 – Updated: 2026-09-17 19:24 – Source website
VLAI
Summary
Directory Traversal in Babel
Details
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Severity
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "babel",
"resource_purl": "pkg:pypi/babel@2.17.0",
"upstream_fixed_in": "2.9.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "csvkit",
"purl": "pkg:brew/csvkit"
},
"ranges": [
{
"events": [
{
"introduced": "1.0.2"
},
{
"fixed": "1.0.6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/babel@2.17.0",
"name": "babel",
"resource": "babel",
"strategy": "registry",
"subject_version": "2.17.0"
}
]
},
"details": "Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.",
"id": "BREW-csvkit-CVE-2021-42771",
"modified": "2026-09-17T19:24:09Z",
"published": "2026-08-13T16:41:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-42771"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/commit/412015ef642bfcc0d8ba8f4d05cdbb6aac98d9b3"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-h4m5-qpfp-3mpv"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/babel/PYSEC-2021-421.yaml"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-5018"
},
{
"type": "WEB",
"url": "https://www.tenable.com/security/research/tra-2021-14"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Directory Traversal in Babel",
"upstream": [
"GHSA-h4m5-qpfp-3mpv",
"CVE-2021-42771",
"PYSEC-2021-421"
]
}
BREW-FAVA-CVE-2021-42771 (GHSA-H4M5-QPFP-3MPV)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:46 – Updated: 2026-09-17 18:01 – Source website
VLAI
Summary
Directory Traversal in Babel
Details
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Severity
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "babel",
"resource_purl": "pkg:pypi/babel@2.18.0",
"upstream_fixed_in": "2.9.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "fava",
"purl": "pkg:brew/fava"
},
"ranges": [
{
"events": [
{
"introduced": "1.14"
},
{
"fixed": "1.19"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/babel@2.18.0",
"name": "babel",
"resource": "babel",
"strategy": "registry",
"subject_version": "2.18.0"
}
]
},
"details": "Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.",
"id": "BREW-fava-CVE-2021-42771",
"modified": "2026-09-17T18:01:22Z",
"published": "2026-08-13T16:46:31Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-42771"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/commit/412015ef642bfcc0d8ba8f4d05cdbb6aac98d9b3"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-h4m5-qpfp-3mpv"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/babel/PYSEC-2021-421.yaml"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-5018"
},
{
"type": "WEB",
"url": "https://www.tenable.com/security/research/tra-2021-14"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Directory Traversal in Babel",
"upstream": [
"GHSA-h4m5-qpfp-3mpv",
"CVE-2021-42771",
"PYSEC-2021-421"
]
}
BREW-JUPYTERLAB-CVE-2021-42771 (GHSA-H4M5-QPFP-3MPV)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:01 – Updated: 2026-09-17 19:02 – Source website
VLAI
Summary
Directory Traversal in Babel
Details
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Severity
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "babel",
"resource_purl": "pkg:pypi/babel@2.18.0",
"upstream_fixed_in": "2.9.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "jupyterlab",
"purl": "pkg:brew/jupyterlab"
},
"ranges": [
{
"events": [
{
"introduced": "3.0.0"
},
{
"fixed": "3.0.15"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/babel@2.18.0",
"name": "babel",
"resource": "babel",
"strategy": "registry",
"subject_version": "2.18.0"
}
]
},
"details": "Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.",
"id": "BREW-jupyterlab-CVE-2021-42771",
"modified": "2026-09-17T19:02:18Z",
"published": "2026-08-13T17:01:18Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-42771"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/commit/412015ef642bfcc0d8ba8f4d05cdbb6aac98d9b3"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-h4m5-qpfp-3mpv"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/babel/PYSEC-2021-421.yaml"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-5018"
},
{
"type": "WEB",
"url": "https://www.tenable.com/security/research/tra-2021-14"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Directory Traversal in Babel",
"upstream": [
"GHSA-h4m5-qpfp-3mpv",
"CVE-2021-42771",
"PYSEC-2021-421"
]
}
BREW-SPHINX-DOC-CVE-2021-42771 (GHSA-H4M5-QPFP-3MPV)
Vulnerability from osv_homebrew – Published: 2026-08-13 17:35 – Updated: 2026-09-10 01:16 – Source website
VLAI
Summary
Directory Traversal in Babel
Details
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Severity
References
| URL | Type | |||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "babel",
"resource_purl": "pkg:pypi/babel@2.18.0",
"upstream_fixed_in": "2.9.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "sphinx-doc",
"purl": "pkg:brew/sphinx-doc"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "9.1.0_4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/babel@2.18.0",
"name": "babel",
"resource": "babel",
"strategy": "registry",
"subject_version": "2.18.0"
}
]
},
"details": "Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.",
"id": "BREW-sphinx-doc-CVE-2021-42771",
"modified": "2026-09-10T01:16:47Z",
"published": "2026-08-13T17:35:57Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-42771"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/commit/412015ef642bfcc0d8ba8f4d05cdbb6aac98d9b3"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-h4m5-qpfp-3mpv"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/babel/PYSEC-2021-421.yaml"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-5018"
},
{
"type": "WEB",
"url": "https://www.tenable.com/security/research/tra-2021-14"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Directory Traversal in Babel",
"upstream": [
"GHSA-h4m5-qpfp-3mpv",
"CVE-2021-42771",
"PYSEC-2021-421"
]
}
CVE-2021-42771 (GCVE-0-2021-42771)
Vulnerability from cvelistv5 – Published: 2021-10-20 20:05 – Updated: 2024-08-04 03:38
VLAI
EPSS
VEX
Summary
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://www.tenable.com/security/research/tra-2021-14 | x_refsource_MISC |
| https://github.com/python-babel/babel/pull/782 | x_refsource_MISC |
| https://lists.debian.org/debian-lts/2021/10/msg00… | x_refsource_MISC |
| https://lists.debian.org/debian-lts-announce/2021… | mailing-listx_refsource_MLIST |
| https://www.debian.org/security/2021/dsa-5018 | vendor-advisoryx_refsource_DEBIAN |
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"name": "https://github.com/python-babel/babel/pull/782",
"refsource": "MISC",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"name": "https://lists.debian.org/debian-lts/2021/10/msg00040.html",
"refsource": "MISC",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"name": "[debian-lts-announce] 20211021 [SECURITY] [DLA 2790-1] python-babel security update",
"refsource": "MLIST",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"name": "DSA-5018",
"refsource": "DEBIAN",
"url": "https://www.debian.org/security/2021/dsa-5018"
}
]
}
}
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2021-42771",
"datePublished": "2021-10-20T20:05:35.000Z",
"dateReserved": "2021-10-20T00:00:00.000Z",
"dateUpdated": "2024-08-04T03:38:50.154Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
GHSA-H4M5-QPFP-3MPV
Vulnerability from github – Published: 2021-10-21 17:49 – Updated: 2024-09-12 20:56
VLAI
Summary
Directory Traversal in Babel
Details
Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.
Severity
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "babel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.9.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2021-42771"
],
"database_specific": {
"cwe_ids": [
"CWE-22"
],
"github_reviewed": true,
"github_reviewed_at": "2021-10-21T14:33:55Z",
"nvd_published_at": "2021-10-20T21:15:00Z",
"severity": "HIGH"
},
"details": "Babel.Locale in Babel before 2.9.1 allows attackers to load arbitrary locale .dat files (containing serialized Python objects) via directory traversal, leading to code execution.",
"id": "GHSA-h4m5-qpfp-3mpv",
"modified": "2024-09-12T20:56:02Z",
"published": "2021-10-21T17:49:59Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-42771"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/pull/782"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel/commit/412015ef642bfcc0d8ba8f4d05cdbb6aac98d9b3"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-h4m5-qpfp-3mpv"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/babel/PYSEC-2021-421.yaml"
},
{
"type": "WEB",
"url": "https://github.com/python-babel/babel"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2021/10/msg00018.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts/2021/10/msg00040.html"
},
{
"type": "WEB",
"url": "https://www.debian.org/security/2021/dsa-5018"
},
{
"type": "WEB",
"url": "https://www.tenable.com/security/research/tra-2021-14"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "Directory Traversal in Babel"
}
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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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