{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-66357", "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "state": "PUBLISHED", "assignerShortName": "EEF", "dateReserved": "2026-08-17T20:00:02.207Z", "datePublished": "2026-09-01T14:40:50.526Z", "dateUpdated": "2026-09-01T15:56:07.942Z"}, "containers": {"cna": {"affected": [{"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "otp", "packageURL": "pkg:sid/erlang.org/otp", "product": "OTP", "vendor": "Erlang", "versions": [{"lessThan": "17.0", "status": "unknown", "version": "0", "versionType": "otp"}, {"lessThan": "27.3.4.17", "status": "affected", "version": "17.0", "versionType": "otp"}, {"lessThan": "28.5.0.6", "status": "affected", "version": "28.0", "versionType": "otp"}, {"lessThan": "29.0.6", "status": "affected", "version": "29.0", "versionType": "otp"}]}, {"cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "inets", "packageURL": "pkg:otp/inets", "product": "OTP", "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"lessThan": "5.10", "status": "unknown", "version": "0", "versionType": "otp"}, {"lessThan": "9.3.2.7", "status": "affected", "version": "5.10", "versionType": "otp"}, {"lessThan": "9.6.2.3", "status": "affected", "version": "9.4", "versionType": "otp"}, {"lessThan": "9.7.2", "status": "affected", "version": "9.7", "versionType": "otp"}]}, {"collectionURL": "https://github.com", "cpes": ["cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"], "defaultStatus": "unaffected", "packageName": "erlang/otp", "packageURL": "pkg:github/erlang/otp", "product": "OTP", "repo": "https://github.com/erlang/otp", "vendor": "Erlang", "versions": [{"changes": [{"at": "220d618d2479a7180b4a06d0c5aacfaa4af4a85b", "status": "unaffected"}, {"at": "273d8958de38ff2a7fe0c5dcc5b6bfe6f65717f3", "status": "unaffected"}, {"at": "e640d599287d2eba919e6f13b91f042d7dbe6ff4", "status": "unaffected"}], "lessThan": "*", "status": "affected", "version": "84adefa331c4159d432d22840663c38f155cd4c1", "versionType": "git"}]}], "cpeApplicability": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "27.3.4.17", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "28.5.0.6", "versionStartIncluding": "28.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionEndExcluding": "29.0.6", "versionStartIncluding": "29.0", "vulnerable": true}], "negate": false, "operator": "OR"}], "operator": "AND"}], "credits": [{"lang": "en", "type": "finder", "value": "Lukas Backstr\u00f6m / Erlang Solutions"}, {"lang": "en", "type": "remediation developer", "value": "Konrad Pietrzak / Ericsson"}], "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "<p>httpd has never implemented obs-fold (RFC 2616 \u00a72.2 / RFC 7230 \u00a73.2.4 header continuation lines). Every CRLF followed by a non-CRLF octet unconditionally starts a new header. This missing feature became a security concern as the understanding of HTTP request smuggling attacks evolved.</p>\n<p>This issue affects OTP from OTP&nbsp;17.0 before OTP&nbsp;27.3.4.17, from OTP&nbsp;28.0 before OTP&nbsp;28.5.0.6, and from OTP&nbsp;29.0 before OTP&nbsp;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&nbsp;17.0, corresponding to inets before 5.10, is affected is unknown.</p>"}, {"base64": false, "type": "text/markdown", "value": "httpd has never implemented obs-fold (RFC 2616 \u00a72.2 / RFC 7230 \u00a73.2.4 header continuation lines). Every CRLF followed by a non-CRLF octet unconditionally starts a new header. This missing feature became a security concern as the understanding of HTTP request smuggling attacks evolved.\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."}], "value": "httpd has never implemented obs-fold (RFC 2616 \u00a72.2 / RFC 7230 \u00a73.2.4 header continuation lines). Every CRLF followed by a non-CRLF octet unconditionally starts a new header. This missing feature became a security concern as the understanding of HTTP request smuggling attacks evolved.\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."}], "impacts": [{"capecId": "CAPEC-33", "descriptions": [{"lang": "en", "value": "CAPEC-33 HTTP Request Smuggling"}]}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.3, "baseSeverity": "HIGH", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "LOW", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:L/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-444", "description": "CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "shortName": "EEF", "dateUpdated": "2026-09-01T14:40:50.526Z"}, "references": [{"tags": ["vendor-advisory"], "url": "https://github.com/erlang/otp/security/advisories/GHSA-qh2f-33hj-37qf"}, {"tags": ["related"], "url": "https://cna.erlef.org/cves/CVE-2026-66357.html"}, {"tags": ["related"], "url": "https://osv.dev/vulnerability/EEF-CVE-2026-66357"}, {"tags": ["patch"], "url": "https://github.com/erlang/otp/commit/220d618d2479a7180b4a06d0c5aacfaa4af4a85b"}, {"tags": ["patch"], "url": "https://github.com/erlang/otp/commit/273d8958de38ff2a7fe0c5dcc5b6bfe6f65717f3"}, {"tags": ["patch"], "url": "https://github.com/erlang/otp/commit/e640d599287d2eba919e6f13b91f042d7dbe6ff4"}], "source": {"discovery": "UNKNOWN"}, "title": "inets,httpd:HTTP Request Smuggling via obs-fold Header Continuation"}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-01T15:56:00.806246Z", "id": "CVE-2026-66357", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-01T15:56:07.942Z"}}]}}

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