{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55149","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-16T15:13:28.164Z","datePublished":"2026-09-15T16:30:37.580Z","dateUpdated":"2026-09-17T16:08:18.413Z"},"containers":{"cna":{"title":"Vouch Proxy: Unbounded Multipart Cookie Allocation DoS","problemTypes":[{"descriptions":[{"cweId":"CWE-789","lang":"en","description":"CWE-789: Memory Allocation with Excessive Size Value","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68","tags":["x_refsource_CONFIRM"],"url":"https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68"},{"name":"https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f","tags":["x_refsource_MISC"],"url":"https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f"},{"name":"https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0","tags":["x_refsource_MISC"],"url":"https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0"}],"affected":[{"vendor":"vouch","product":"vouch-proxy","versions":[{"version":"< 0.48.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-15T16:30:37.580Z"},"descriptions":[{"lang":"en","value":"Vouch Proxy is an SSO and OAuth/OIDC login solution for Nginx using the auth_request module. Prior to 0.48.0, Cookie in pkg/cookie/cookie.go parses the total part count from an attacker-controlled multipart cookie name and passes the value to make([]string, numParts) without checking that the value is positive or reasonably bounded. Requests to /validate and /_external-auth-:id reach JWTCacheHandler in pkg/jwtmanager/jwtcache.go, FindJWT in pkg/jwtmanager/jwtmanager.go, and the vulnerable cookie reassembly before JWT validation, so no account or valid session is required. A cookie name such as VouchCookie_1of10000000000 causes an attempted slice allocation of roughly 160 GB and a fatal Go runtime out-of-memory condition, allowing one request to crash the authentication proxy and repeated requests to sustain unavailability. This vulnerability is fixed in 0.48.0."}],"source":{"advisory":"GHSA-qqff-5854-px68","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-17T16:05:30.568513Z","id":"CVE-2026-55149","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"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":"2026-09-17T16:08:18.413Z"}}]}}