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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\"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-130 Excessive Allocation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 8.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"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\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-plug/plug\", \"vendor\": \"elixir-plug\", \"modules\": [\"Elixir.Plug.Conn\"], \"product\": \"plug\", \"versions\": [{\"status\": \"affected\", \"version\": \"1.4.0\", \"lessThan\": \"1.15.4\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.16.0\", \"lessThan\": \"1.16.3\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.17.0\", \"lessThan\": \"1.17.1\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.18.0\", \"lessThan\": \"1.18.2\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.19.0\", \"lessThan\": \"1.19.2\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/plug\", \"packageName\": \"plug\", \"programFiles\": [\"lib/plug/conn.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Plug.Conn\u0027:read_part_headers/2\"}]}, {\"cpes\": [\"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-plug/plug\", \"vendor\": \"elixir-plug\", \"modules\": [\"Elixir.Plug.Conn\"], \"product\": \"plug\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"2cb7958d33030aa826b0c7404375844d4593d43a\", \"status\": \"unaffected\"}, {\"at\": \"aa69c5ece99c40ded88b8c6581ecc86664b0b734\", \"status\": \"unaffected\"}, {\"at\": \"d5dfffe25e975585227b1b85d247b0d14164bc45\", \"status\": \"unaffected\"}, {\"at\": \"df812a1527bae9e941965e897308a2b8bbf83a94\", \"status\": \"unaffected\"}, {\"at\": \"33858427c7f2737d560a2e40a0c9a9270d77d1d7\", \"status\": \"unaffected\"}], \"version\": \"c52b2f32c90bccd718202bafccb5f95594e30183\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/elixir-plug/plug\", \"packageName\": \"elixir-plug/plug\", \"programFiles\": [\"lib/plug/conn.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Plug.Conn\u0027:read_part_headers/2\"}]}], \"references\": [{\"url\": \"https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64\", \"tags\": [\"vendor-advisory\", \"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\": [\"related\"]}, {\"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\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"configurations\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.15.4\", \"versionStartIncluding\": \"1.4.0\"}, {\"criteria\": \"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.16.3\", \"versionStartIncluding\": \"1.16.0\"}, {\"criteria\": \"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.17.1\", \"versionStartIncluding\": \"1.17.0\"}, {\"criteria\": \"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.18.2\", \"versionStartIncluding\": \"1.18.0\"}, {\"criteria\": \"cpe:2.3:a:plug_project:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.19.2\", \"versionStartIncluding\": \"1.19.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-05-27T15:41:29.241Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-8468\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-27T15:41:29.241Z\", \"dateReserved\": \"2026-05-13T11:44:42.164Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-05-14T10:29:51.062Z\", \"assignerShortName\": \"EEF\"}",
"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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