CVE-2026-55149
- Source
- https://cve.org/CVERecord?id=CVE-2026-55149
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55149.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-55149
- Aliases
- Downstream
- Related
- Published
- 2026-09-15T16:30:37Z
- Modified
- 2026-09-18T03:30:52Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Vouch Proxy: Unbounded Multipart Cookie Allocation DoS
- Details
-
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.
- Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-789" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55149.json" }- References
-
- https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55149.json
- https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68
- https://nvd.nist.gov/vuln/detail/CVE-2026-55149
- https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f