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 | CPE status | |
|---|---|---|---|---|
| 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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"status": "final",
"title": "Unbounded buffer accumulation in multipart header parsing causes denial of service in plug",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8468.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2026-8468",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-14T17:53:52.632415Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"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": [
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"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"
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{
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"url": "https://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734"
},
{
"tags": [
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"url": "https://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45"
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{
"tags": [
"patch"
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"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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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
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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.