{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "2.11.0"
              },
              {
                "fixed": "2.13.0"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "697344d25990641b8b2aa85f0a60634b590b5702"
            },
            {
              "fixed": "7144e4534c34810f4525dc4578a32addd8212cff"
            },
            {
              "fixed": "0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"
            }
          ],
          "repo": "https://github.com/jpadilla/pyjwt",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-gvp8-978c-rx2q"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-471"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103001.json"
  },
  "details": "PyJWT is a Python implementation of JSON Web Token standards. From 2.11.0 through 2.13.0, PyJWT's PyJWT._merge_options() method can modify a caller-supplied mutable options mapping when verify_signature is false. If an application reuses that same mapping for a later decode() or decode_complete() call and changes verify_signature to true, the mapping can retain false values for expiration, not-before, issued-at, audience, issuer, subject, and JWT ID checks. A signed token with invalid registered claims can then be accepted without disabling signature verification, but applications that create a fresh options mapping for each call are not affected.",
  "id": "CVE-2026-103001",
  "modified": "2026-10-02T03:30:49.458605317Z",
  "published": "2026-09-30T21:15:12.862Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103001.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/jpadilla/pyjwt/security/advisories/GHSA-gvp8-978c-rx2q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103001"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/jpadilla/pyjwt/issues/679"
    },
    {
      "type": "FIX",
      "url": "https://github.com/jpadilla/pyjwt/commit/0c87c8c8b1a74cac99ad8115f3050efcb7fbed35"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "PyJWT.decode() reintroduces options-dict mutation, enabling silent claim-verification bypass on dict reuse"
}