CVE-2026-8468 (GCVE-0-2026-8468)
Vulnerability from cvelistv5 – Published: 2026-05-14 10:29 – Updated: 2026-05-27 15:41
VLAI
EPSS
VEX
Title
Unbounded buffer accumulation in multipart header parsing causes denial of service in plug
Summary
Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing.
'Elixir.Plug.Conn':read_part_headers/2 in lib/plug/conn.ex does not obey its :length parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function read_part_body has an explicit byte_size(acc) > length guard that stops accumulation once a limit is reached. No such guard exists in read_part_headers. An unauthenticated remote attacker can exhaust server memory by sending a crafted multipart/form-data request, causing a denial of service.
This issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-14 17:53 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| elixir-plug | plug |
Affected:
1.4.0 , < 1.15.4
(semver)
Affected: 1.16.0 , < 1.16.3 (semver) Affected: 1.17.0 , < 1.17.1 (semver) Affected: 1.18.0 , < 1.18.2 (semver) Affected: 1.19.0 , < 1.19.2 (semver) cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:* |
|
| elixir-plug | plug |
Affected:
c52b2f32c90bccd718202bafccb5f95594e30183 , < *
(git)
cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:* |
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],
"providerMetadata": {
"dateUpdated": "2026-05-14T17:54:03.803Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"Elixir.Plug.Conn"
],
"packageName": "plug",
"packageURL": "pkg:hex/plug",
"product": "plug",
"programFiles": [
"lib/plug/conn.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Plug.Conn\u0027:read_part_headers/2"
}
],
"repo": "https://github.com/elixir-plug/plug",
"vendor": "elixir-plug",
"versions": [
{
"lessThan": "1.15.4",
"status": "affected",
"version": "1.4.0",
"versionType": "semver"
},
{
"lessThan": "1.16.3",
"status": "affected",
"version": "1.16.0",
"versionType": "semver"
},
{
"lessThan": "1.17.1",
"status": "affected",
"version": "1.17.0",
"versionType": "semver"
},
{
"lessThan": "1.18.2",
"status": "affected",
"version": "1.18.0",
"versionType": "semver"
},
{
"lessThan": "1.19.2",
"status": "affected",
"version": "1.19.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"Elixir.Plug.Conn"
],
"packageName": "elixir-plug/plug",
"packageURL": "pkg:github/elixir-plug/plug",
"product": "plug",
"programFiles": [
"lib/plug/conn.ex"
],
"programRoutines": [
{
"name": "\u0027Elixir.Plug.Conn\u0027:read_part_headers/2"
}
],
"repo": "https://github.com/elixir-plug/plug",
"vendor": "elixir-plug",
"versions": [
{
"changes": [
{
"at": "2cb7958d33030aa826b0c7404375844d4593d43a",
"status": "unaffected"
},
{
"at": "aa69c5ece99c40ded88b8c6581ecc86664b0b734",
"status": "unaffected"
},
{
"at": "d5dfffe25e975585227b1b85d247b0d14164bc45",
"status": "unaffected"
},
{
"at": "df812a1527bae9e941965e897308a2b8bbf83a94",
"status": "unaffected"
},
{
"at": "33858427c7f2737d560a2e40a0c9a9270d77d1d7",
"status": "unaffected"
}
],
"lessThan": "*",
"status": "affected",
"version": "c52b2f32c90bccd718202bafccb5f95594e30183",
"versionType": "git"
}
]
}
],
"configurations": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eThe application must use \u003ctt\u003ePlug.Parsers\u003c/tt\u003e with the \u003ctt\u003e:multipart\u003c/tt\u003e parser, or otherwise call \u003ctt\u003ePlug.Conn.read_part_headers/2\u003c/tt\u003e to process \u003ctt\u003emultipart/form-data\u003c/tt\u003e request bodies. Deployments that do not handle multipart uploads are not affected.\u003c/p\u003e"
}
],
"value": "The application must use Plug.Parsers with the :multipart parser, or otherwise call Plug.Conn.read_part_headers/2 to process multipart/form-data request bodies. Deployments that do not handle multipart uploads are not affected."
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.15.4",
"versionStartIncluding": "1.4.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.16.3",
"versionStartIncluding": "1.16.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.17.1",
"versionStartIncluding": "1.17.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.18.2",
"versionStartIncluding": "1.18.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*",
"versionEndExcluding": "1.19.2",
"versionStartIncluding": "1.19.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Jos\u00e9 Valim"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Jos\u00e9 Valim"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAllocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing.\u003c/p\u003e\u003cp\u003e\u003ctt\u003e\u0027Elixir.Plug.Conn\u0027:read_part_headers/2\u003c/tt\u003e in \u003ctt\u003elib/plug/conn.ex\u003c/tt\u003e does not obey its \u003ctt\u003e:length\u003c/tt\u003e parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function \u003ctt\u003eread_part_body\u003c/tt\u003e has an explicit \u003ctt\u003ebyte_size(acc) \u0026gt; length\u003c/tt\u003e guard that stops accumulation once a limit is reached. No such guard exists in \u003ctt\u003eread_part_headers\u003c/tt\u003e. An unauthenticated remote attacker can exhaust server memory by sending a crafted \u003ctt\u003emultipart/form-data\u003c/tt\u003e request, causing a denial of service.\u003c/p\u003e\u003cp\u003eThis issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.\u003c/p\u003e"
}
],
"value": "Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing.\n\n\u0027Elixir.Plug.Conn\u0027:read_part_headers/2 in lib/plug/conn.ex does not obey its :length parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function read_part_body has an explicit byte_size(acc) \u003e length guard that stops accumulation once a limit is reached. No such guard exists in read_part_headers. An unauthenticated remote attacker can exhaust server memory by sending a crafted multipart/form-data request, causing a denial of service.\n\nThis issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2."
}
],
"impacts": [
{
"capecId": "CAPEC-130",
"descriptions": [
{
"lang": "en",
"value": "CAPEC-130 Excessive Allocation"
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"privilegesRequired": "NONE",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-770",
"description": "CWE-770 Allocation of Resources Without Limits or Throttling",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T15:41:29.241Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"tags": [
"vendor-advisory",
"related"
],
"url": "https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-8468.html"
},
{
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-8468"
},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-8466.html"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43a"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94"
},
{
"tags": [
"patch"
],
"url": "https://github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7"
}
],
"source": {
"discovery": "INTERNAL"
},
"title": "Unbounded buffer accumulation in multipart header parsing causes denial of service in plug",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-8468",
"datePublished": "2026-05-14T10:29:51.062Z",
"dateReserved": "2026-05-13T11:44:42.164Z",
"dateUpdated": "2026-05-27T15:41:29.241Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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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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