{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.7.4"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "f409f8f058225d7686acab6546c94593e4c1bfbe"
            },
            {
              "fixed": "7facdee77fc8735ad88e586b31c5b0c940ee0a78"
            }
          ],
          "repo": "https://github.com/authlib/joserfc",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-4pp3-559j-c5c2"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-290",
      "CWE-345",
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102946.json"
  },
  "details": "joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. Prior to 1.7.4, joserfc.jws.deserialize_json() accepts a JWS General JSON Serialization with an empty signatures array as authenticated. The verify_general_json() loop performs no iterations for the empty array and returns success because no signature check failed, allowing an attacker without a signing key to supply an arbitrary payload that relying applications may treat as authentic. The issue affects the General JSON Serialization path; compact JWS and JWT decoding, Flattened JSON serialization, and JWE JSON processing do not follow this vulnerable path. This issue is fixed in version 1.7.4.",
  "id": "CVE-2026-102946",
  "modified": "2026-10-17T02:30:22.615614938Z",
  "published": "2026-10-15T18:28:06.913Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/authlib/joserfc/releases/tag/1.7.4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102946.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/authlib/joserfc/security/advisories/GHSA-4pp3-559j-c5c2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102946"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/joserfc/commit/f409f8f058225d7686acab6546c94593e4c1bfbe"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "joserfc: JWS signature verification bypass via empty signatures array in jws.deserialize_json"
}