{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.48.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "fa18ce30ba50a4863a436acad044c22965329c4f"
            },
            {
              "fixed": "62eadec50dd1d8602a355edf2fc991b5e1e318d7"
            }
          ],
          "repo": "https://github.com/vouch/vouch-proxy",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-qqff-5854-px68"
  ],
  "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"
  },
  "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.",
  "id": "CVE-2026-55149",
  "modified": "2026-09-19T03:30:24.056861084Z",
  "published": "2026-09-15T16:30:37.580Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/vouch/vouch-proxy/releases/tag/v0.48.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55149.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/vouch/vouch-proxy/security/advisories/GHSA-qqff-5854-px68"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55149"
    },
    {
      "type": "FIX",
      "url": "https://github.com/vouch/vouch-proxy/commit/fa18ce30ba50a4863a436acad044c22965329c4f"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Vouch Proxy: Unbounded Multipart Cookie Allocation DoS"
}