{"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"}}]}}

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{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.48.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "vouch-proxy", "source": "cna", "vendor": "vouch"}, "product": "vouch-proxy", "vendor": "vouch"}], "created": "2026-09-16T02:15:18.215777+00:00", "updated": "2026-09-17T19:57:58.902536+00:00", "vendors": ["vouch", "vouch$PRODUCT$vouch-proxy"]}