CVE-2026-56814 (GCVE-0-2026-56814)
Vulnerability from cvelistv5 – Published: 2026-07-10 11:14 – Updated: 2026-07-10 14:41
VLAI
EPSS
VEX
Title
Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)
Summary
Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.
Because every part whose Content-Disposition carries a non-empty filename creates a fresh temporary file (via Plug.Upload) and retains a Plug.Upload struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured :length limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.
This vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4.
This issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 1.20.3.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
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 , < 1.16.6
(semver)
Affected: 1.17.0 , < 1.17.4 (semver) Affected: 1.18.0 , < 1.18.5 (semver) Affected: 1.19.0 , < 1.19.5 (semver) Affected: 1.20.0 , < 1.20.3 (semver) cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:* |
|
| elixir-plug | plug |
Affected:
c52b2f32c90bccd718202bafccb5f95594e30183 , < *
(git)
cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:* |
Credits
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Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.\\n\\nThis vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4.\\n\\nThis issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 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Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-770\"}]}],\"references\":[{\"url\":\"https://cna.erlef.org/cves/CVE-2026-56814.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/commit/0ee8afcc61466dc5f7a8f048d0632c899165b81f\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/commit/56edca2ce35fe5589cd581644d8a4493fa5f484e\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/commit/981597d3a4271ede64373c7a731702a42c500dd6\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/commit/cae36053350e5215a4e0ca33cd130af9c5fc6364\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/commit/df97d3f17f808a9916a7700a701fb85314559d56\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/commit/f7effaed811c00b5f5bf817936bfd9c5df27b7dc\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/elixir-plug/plug/security/advisories/GHSA-95qv-c9g9-rm63\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-56814\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-56814\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-07-10T14:03:11.744626Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-07-10T14:03:24.796Z\"}}], \"cna\": {\"title\": \"Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Jos\\u00e9 Valim\"}], \"impacts\": [{\"capecId\": \"CAPEC-130\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-130 Excessive Allocation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 6.9, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"LOW\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-plug/plug\", \"vendor\": \"elixir-plug\", \"modules\": [\"\u0027Elixir.Plug.Parsers.MULTIPART\u0027\"], \"product\": \"plug\", \"versions\": [{\"status\": \"affected\", \"version\": \"1.4.0\", \"lessThan\": \"1.16.6\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.17.0\", \"lessThan\": \"1.17.4\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.18.0\", \"lessThan\": \"1.18.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.19.0\", \"lessThan\": \"1.19.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"1.20.0\", \"lessThan\": \"1.20.3\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/plug\", \"packageName\": \"plug\", \"programFiles\": [\"lib/plug/parsers/multipart.ex\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart/2\"}, {\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_headers/5\"}, {\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_body/4\"}, {\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_file/4\"}]}, {\"cpes\": [\"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/elixir-plug/plug\", \"vendor\": \"elixir-plug\", \"modules\": [\"\u0027Elixir.Plug.Parsers.MULTIPART\u0027\"], \"product\": \"plug\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"981597d3a4271ede64373c7a731702a42c500dd6\", \"status\": \"unaffected\"}, {\"at\": \"56edca2ce35fe5589cd581644d8a4493fa5f484e\", \"status\": \"unaffected\"}, {\"at\": \"0ee8afcc61466dc5f7a8f048d0632c899165b81f\", \"status\": \"unaffected\"}, {\"at\": \"cae36053350e5215a4e0ca33cd130af9c5fc6364\", \"status\": \"unaffected\"}, {\"at\": \"f7effaed811c00b5f5bf817936bfd9c5df27b7dc\", \"status\": \"unaffected\"}, {\"at\": \"df97d3f17f808a9916a7700a701fb85314559d56\", \"status\": \"unaffected\"}], \"version\": \"c52b2f32c90bccd718202bafccb5f95594e30183\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/elixir-plug/plug\", \"packageName\": \"elixir-plug/plug\", \"programFiles\": [\"lib/plug/parsers/multipart.ex\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart/2\"}, {\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_headers/5\"}, {\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_body/4\"}, {\"name\": \"\u0027Elixir.Plug.Parsers.MULTIPART\u0027:parse_multipart_file/4\"}]}], \"references\": [{\"url\": \"https://github.com/elixir-plug/plug/security/advisories/GHSA-95qv-c9g9-rm63\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-56814.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-56814\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/elixir-plug/plug/commit/981597d3a4271ede64373c7a731702a42c500dd6\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/elixir-plug/plug/commit/56edca2ce35fe5589cd581644d8a4493fa5f484e\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/elixir-plug/plug/commit/0ee8afcc61466dc5f7a8f048d0632c899165b81f\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/elixir-plug/plug/commit/cae36053350e5215a4e0ca33cd130af9c5fc6364\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/elixir-plug/plug/commit/f7effaed811c00b5f5bf817936bfd9c5df27b7dc\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/elixir-plug/plug/commit/df97d3f17f808a9916a7700a701fb85314559d56\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Plug.Parsers.MULTIPART, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its :length budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the :length limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.\\n\\nBecause every part whose Content-Disposition carries a non-empty filename creates a fresh temporary file (via Plug.Upload) and retains a Plug.Upload struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured :length limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using Plug.Parsers with the :multipart parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.\\n\\nThis vulnerability is associated with program files lib/plug/parsers/multipart.ex and program routines Plug.Parsers.MULTIPART.parse_multipart/2, Plug.Parsers.MULTIPART.parse_multipart_headers/5, Plug.Parsers.MULTIPART.parse_multipart_body/4, and Plug.Parsers.MULTIPART.parse_multipart_file/4.\\n\\nThis issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 1.20.3.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003e\u003ctt\u003ePlug.Parsers.MULTIPART\u003c/tt\u003e, the multipart request-body parser used to handle file uploads and multipart forms, does not enforce its \u003ctt\u003e:length\u003c/tt\u003e budget against all consumed resources, allowing an unauthenticated remote attacker to cause denial of service. The parser charges the \u003ctt\u003e:length\u003c/tt\u003e limit only for part body bytes; part header bytes are never counted, and a part with an empty body costs zero.\u003c/p\u003e\u003cp\u003eBecause every part whose \u003ctt\u003eContent-Disposition\u003c/tt\u003e carries a non-empty \u003ctt\u003efilename\u003c/tt\u003e creates a fresh temporary file (via \u003ctt\u003ePlug.Upload\u003c/tt\u003e) and retains a \u003ctt\u003ePlug.Upload\u003c/tt\u003e struct for the duration of the request, an attacker can send a single request composed of many empty-body file parts. Such a request stays well under the configured \u003ctt\u003e:length\u003c/tt\u003e limit (8,000,000 bytes by default) while creating one temporary file per part, leading to inode and disk exhaustion and unbounded memory growth. Any application using \u003ctt\u003ePlug.Parsers\u003c/tt\u003e with the \u003ctt\u003e:multipart\u003c/tt\u003e parser is affected, and no authentication is required, only reachability of a multipart endpoint over HTTP.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/plug/parsers/multipart.ex\u003c/tt\u003e and program routines \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart/2\u003c/tt\u003e, \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart_headers/5\u003c/tt\u003e, \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart_body/4\u003c/tt\u003e, and \u003ctt\u003ePlug.Parsers.MULTIPART.parse_multipart_file/4\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects plug: from 1.4.0 before 1.16.6, from 1.17.0 before 1.17.4, from 1.18.0 before 1.18.5, from 1.19.0 before 1.19.5, and from 1.20.0 before 1.20.3.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-770\", \"description\": \"CWE-770 Allocation of Resources Without Limits or Throttling\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.16.6\", \"versionStartIncluding\": \"1.4.0\"}, {\"criteria\": \"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.17.4\", \"versionStartIncluding\": \"1.17.0\"}, {\"criteria\": \"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.18.5\", \"versionStartIncluding\": \"1.18.0\"}, {\"criteria\": \"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.19.5\", \"versionStartIncluding\": \"1.19.0\"}, {\"criteria\": \"cpe:2.3:a:elixir-plug:plug:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"1.20.3\", \"versionStartIncluding\": \"1.20.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-07-10T11:14:35.574Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-56814\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-10T14:03:28.156Z\", \"dateReserved\": \"2026-06-23T12:29:02.507Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-07-10T11:14:35.574Z\", \"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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