{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
                "range": [
                  {
                    "introduced": "1.3.1"
                  },
                  {
                    "fixed": "1.9.0"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "range": [
                  {
                    "fixed": "e3bd41cb29dcfee434453b135ffb487884baeedf"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v1.9.0",
                "range": [
                  {
                    "fixed": "e8d50bd7dc442fde1364291df9c429d1da91c0cb"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "df226ab587c453029ef5083a7e1c5dc6772647dd"
            },
            {
              "fixed": "e8d50bd7dc442fde1364291df9c429d1da91c0cb"
            },
            {
              "fixed": "e3bd41cb29dcfee434453b135ffb487884baeedf"
            }
          ],
          "repo": "https://github.com/authlib/authlib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-7vr2-2fgp-9w7p"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-184",
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114615.json"
  },
  "details": "Authlib is a Python library which builds OAuth and OpenID Connect servers. From 1.3.1 until 1.9.0, OctKey.import_key() checks asymmetric-key markers only at byte zero while Authlib's PEM loaders accept leading whitespace, comments, or a byte-order mark. In deployments that use the documented mixed algorithm registry and already configure verification with PEM or certificate bytes containing such a prefix, an unauthenticated attacker who knows those same public-key bytes can use them as an HMAC secret and forge HS256 tokens with arbitrary identity or authorization claims. This is a bypass of the remediation for CVE-2024-37568. The module-level jwt object reaches OctKey.import_key() in authlib/jose/rfc7518/oct_key.py, where POSSIBLE_UNSAFE_KEYS fails to identify prefixed asymmetric key material. This issue is fixed in version 1.9.0.",
  "id": "CVE-2026-114615",
  "modified": "2026-10-31T02:30:16.139414552Z",
  "published": "2026-10-22T21:10:02.023Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/authlib/authlib/releases/tag/v1.9.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114615.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-7vr2-2fgp-9w7p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114615"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/commit/e3bd41cb29dcfee434453b135ffb487884baeedf"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/pull/945"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Authlib incomplete algorithm-confusion fix permits HMAC forgery with prefixed public keys"
}