CVE-2026-55951 (GCVE-0-2026-55951)
Vulnerability from cvelistv5 – Published: 2026-09-01 14:37 – Updated: 2026-09-01 15:54
VLAI
EPSS
VEX
Title
httpc memory exhaustion via unbounded response header accumulation
Summary
The Erlang/OTP httpc HTTP client does not enforce a limit on the total size of response headers received from a server. The max_header_size option defaults to nolimit, and httpc_response:parse_headers/6 accumulates every header into a list before the length check runs (which only fires after the terminating CRLF CRLF is received).
A malicious or compromised HTTP server can send an arbitrarily large number of headers, or headers with very large values, causing the client process to allocate unbounded memory until the system runs out of memory or the BEAM VM crashes. A proof-of-concept server sending 100,000 headers of roughly 4000 bytes each caused the client VM to allocate over 13 GB of memory in under 30 seconds.
Any application using httpc:request/4,5 to connect to untrusted servers is affected. No authentication is required: any server the client connects to (including via a redirect or man-in-the-middle) can trigger the exhaustion.
This issue affects OTP from OTP 17.0 before OTP 27.3.4.17, from OTP 28.0 before OTP 28.5.0.6, and from OTP 29.0 before OTP 29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-01 15:53 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://github.com/erlang/otp/security/advisories… | vendor-advisory |
| https://cna.erlef.org/cves/CVE-2026-55951.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-55951 | related |
| https://www.erlang.org/doc/system/versions.html#o… | x_version-scheme |
| https://github.com/erlang/otp/commit/aba0fe8c2d70… | patch |
| https://github.com/erlang/otp/commit/e3be1cfe9f6c… | patch |
Impacted products
3 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Erlang | OTP |
Unknown:
0 , < 17.0
(otp)
Affected: 17.0 , < 27.3.4.17 (otp) Affected: 28.0 , < 28.5.0.6 (otp) Affected: 29.0 , < 29.0.6 (otp) cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
||
| Erlang | OTP |
Unknown:
0 , < 5.10
(otp)
Affected: 5.10 , < 9.3.2.7 (otp) Affected: 9.4 , < 9.6.2.3 (otp) Affected: 9.7 , < 9.7.2 (otp) cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
||
| Erlang | OTP |
Affected:
84adefa331c4159d432d22840663c38f155cd4c1 , < *
(git)
cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* |
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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-2026-55951.html\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/erlang/otp/commit/aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/erlang/otp/commit/e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/erlang/otp/security/advisories/GHSA-f9fw-mg7q-4g3x\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-55951\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://www.erlang.org/doc/system/versions.html#order-of-versions\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"}]}}",
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-55951\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-01T15:53:49.437447Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-01T15:54:11.168Z\"}}], \"cna\": {\"title\": \"httpc memory exhaustion via unbounded response header accumulation\", \"source\": {\"discovery\": \"UNKNOWN\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Konrad Pietrzak / Ericsson\"}], \"impacts\": [{\"capecId\": \"CAPEC-130\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-130 Excessive Allocation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"Safety\": \"NOT_DEFINED\", \"version\": \"4.0\", \"Recovery\": \"NOT_DEFINED\", \"baseScore\": 8.2, \"Automatable\": \"NOT_DEFINED\", \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"valueDensity\": \"NOT_DEFINED\", \"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\", \"providerUrgency\": \"NOT_DEFINED\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\", \"vulnerabilityResponseEffort\": \"NOT_DEFINED\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\"], \"vendor\": \"Erlang\", \"modules\": [\"httpc_response\", \"httpc_handler\", \"httpc\"], \"product\": \"OTP\", \"versions\": [{\"status\": \"unknown\", \"version\": \"0\", \"lessThan\": \"17.0\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"17.0\", \"lessThan\": \"27.3.4.17\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"28.0\", \"lessThan\": \"28.5.0.6\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"29.0\", \"lessThan\": \"29.0.6\", \"versionType\": \"otp\"}], \"packageURL\": \"pkg:sid/erlang.org/otp\", \"packageName\": \"otp\", \"programFiles\": [\"src/http_client/httpc_response.erl\", \"src/http_client/httpc_handler.erl\", \"src/http_client/httpc.erl\"], \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"httpc_response:parse_headers/6\"}, {\"name\": \"httpc:request/4\"}, {\"name\": \"httpc:request/5\"}]}, {\"cpes\": [\"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/erlang/otp\", \"vendor\": \"Erlang\", \"product\": \"OTP\", \"versions\": [{\"status\": \"unknown\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"5.10\", \"lessThan\": \"9.3.2.7\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"9.4\", \"lessThan\": \"9.6.2.3\", \"versionType\": \"otp\"}, {\"status\": \"affected\", \"version\": \"9.7\", \"lessThan\": \"9.7.2\", \"versionType\": \"otp\"}], \"packageURL\": \"pkg:otp/inets\", \"packageName\": \"inets\", \"defaultStatus\": \"unaffected\"}, {\"cpes\": [\"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/erlang/otp\", \"vendor\": \"Erlang\", \"modules\": [\"httpc_response\", \"httpc_handler\", \"httpc\"], \"product\": \"OTP\", \"versions\": [{\"status\": \"affected\", \"changes\": [{\"at\": \"aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d\", \"status\": \"unaffected\"}, {\"at\": \"e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa\", \"status\": \"unaffected\"}], \"version\": \"84adefa331c4159d432d22840663c38f155cd4c1\", \"lessThan\": \"*\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/erlang/otp\", \"packageName\": \"erlang/otp\", \"programFiles\": [\"src/http_client/httpc_response.erl\", \"src/http_client/httpc_handler.erl\", \"src/http_client/httpc.erl\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"httpc_response:parse_headers/6\"}, {\"name\": \"httpc:request/4\"}, {\"name\": \"httpc:request/5\"}]}], \"references\": [{\"url\": \"https://github.com/erlang/otp/security/advisories/GHSA-f9fw-mg7q-4g3x\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-55951.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-55951\", \"tags\": [\"related\"]}, {\"url\": \"https://www.erlang.org/doc/system/versions.html#order-of-versions\", \"tags\": [\"x_version-scheme\"]}, {\"url\": \"https://github.com/erlang/otp/commit/aba0fe8c2d700bf4ac94607cf7f00e53bbe4042d\", \"tags\": [\"patch\"]}, {\"url\": \"https://github.com/erlang/otp/commit/e3be1cfe9f6cedd0cd20d9905e05601dfb31c8aa\", \"tags\": [\"patch\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"* Restrict httpc to trusted servers only, and avoid using it to fetch resources from arbitrary or user-supplied URLs.\\n* Apply operating-system memory limits (cgroups,ulimit) to contain the blast radius of a runaway client process.\\n* Use an alternative HTTP client library that enforces a response header size limit.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cul\u003e\\n\u003cli\u003eRestrict \u003ccode\u003ehttpc\u003c/code\u003e to trusted servers only, and avoid using it to fetch resources from arbitrary or user-supplied URLs.\u003c/li\u003e\\n\u003cli\u003eApply operating-system memory limits (cgroups,\u003ccode\u003eulimit\u003c/code\u003e) to contain the blast radius of a runaway client process.\u003c/li\u003e\\n\u003cli\u003eUse an alternative HTTP client library that enforces a response header size limit.\u003c/li\u003e\\n\u003c/ul\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"* Restrict `httpc` to trusted servers only, and avoid using it to fetch resources from arbitrary or user-supplied URLs.\\n* Apply operating-system memory limits (cgroups,`ulimit`) to contain the blast radius of a runaway client process.\\n* Use an alternative HTTP client library that enforces a response header size limit.\", \"base64\": false}]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The Erlang/OTP httpc HTTP client does not enforce a limit on the total size of response headers received from a server. The max_header_size option defaults to nolimit, and httpc_response:parse_headers/6 accumulates every header into a list before the length check runs (which only fires after the terminating CRLF CRLF is received).\\n\\nA malicious or compromised HTTP server can send an arbitrarily large number of headers, or headers with very large values, causing the client process to allocate unbounded memory until the system runs out of memory or the BEAM VM crashes. A proof-of-concept server sending 100,000 headers of roughly 4000 bytes each caused the client VM to allocate over 13 GB of memory in under 30 seconds.\\n\\nAny application using httpc:request/4,5 to connect to untrusted servers is affected. No authentication is required: any server the client connects to (including via a redirect or man-in-the-middle) can trigger the exhaustion.\\n\\nThis issue affects OTP from OTP\\u00a017.0 before OTP\\u00a027.3.4.17, from OTP\\u00a028.0 before OTP\\u00a028.5.0.6, and from OTP\\u00a029.0 before OTP\\u00a029.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP\\u00a017.0, corresponding to inets before 5.10, is affected is unknown.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"\u003cp\u003eThe Erlang/OTP \u003ccode\u003ehttpc\u003c/code\u003e HTTP client does not enforce a limit on the total size of response headers received from a server. The \u003ccode\u003emax_header_size\u003c/code\u003e option defaults to \u003ccode\u003enolimit\u003c/code\u003e, and \u003ccode\u003ehttpc_response:parse_headers/6\u003c/code\u003e accumulates every header into a list before the length check runs (which only fires after the terminating CRLF CRLF is received).\u003c/p\u003e\\n\u003cp\u003eA malicious or compromised HTTP server can send an arbitrarily large number of headers, or headers with very large values, causing the client process to allocate unbounded memory until the system runs out of memory or the BEAM VM crashes. A proof-of-concept server sending 100,000 headers of roughly 4000 bytes each caused the client VM to allocate over 13 GB of memory in under 30 seconds.\u003c/p\u003e\\n\u003cp\u003eAny application using \u003ccode\u003ehttpc:request/4,5\u003c/code\u003e to connect to untrusted servers is affected. No authentication is required: any server the client connects to (including via a redirect or man-in-the-middle) can trigger the exhaustion.\u003c/p\u003e\\n\u003cp\u003eThis issue affects OTP from OTP\u0026nbsp;17.0 before OTP\u0026nbsp;27.3.4.17, from OTP\u0026nbsp;28.0 before OTP\u0026nbsp;28.5.0.6, and from OTP\u0026nbsp;29.0 before OTP\u0026nbsp;29.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP\u0026nbsp;17.0, corresponding to inets before 5.10, is affected is unknown.\u003c/p\u003e\", \"base64\": false}, {\"type\": \"text/markdown\", \"value\": \"The Erlang/OTP `httpc` HTTP client does not enforce a limit on the total size of response headers received from a server. The `max_header_size` option defaults to `nolimit`, and `httpc_response:parse_headers/6` accumulates every header into a list before the length check runs (which only fires after the terminating CRLF CRLF is received).\\n\\nA malicious or compromised HTTP server can send an arbitrarily large number of headers, or headers with very large values, causing the client process to allocate unbounded memory until the system runs out of memory or the BEAM VM crashes. A proof-of-concept server sending 100,000 headers of roughly 4000 bytes each caused the client VM to allocate over 13 GB of memory in under 30 seconds.\\n\\nAny application using `httpc:request/4,5` to connect to untrusted servers is affected. No authentication is required: any server the client connects to (including via a redirect or man-in-the-middle) can trigger the exhaustion.\\n\\nThis issue affects OTP from OTP\\u00a017.0 before OTP\\u00a027.3.4.17, from OTP\\u00a028.0 before OTP\\u00a028.5.0.6, and from OTP\\u00a029.0 before OTP\\u00a029.0.6, corresponding to inets from 5.10 before 9.3.2.7, from 9.4 before 9.6.2.3, and from 9.7 before 9.7.2. Whether OTP before OTP\\u00a017.0, corresponding to inets before 5.10, is affected is unknown.\", \"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:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.17\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.5.0.6\", \"versionStartIncluding\": \"28.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"29.0.6\", \"versionStartIncluding\": \"29.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-09-01T14:37:02.650Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-55951\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-09-01T15:54:18.435Z\", \"dateReserved\": \"2026-06-17T17:55:15.685Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-09-01T14:37:02.650Z\", \"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.
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.
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