{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "cpe": "cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*",
                "range": [
                  {
                    "introduced": "1.6.0"
                  },
                  {
                    "fixed": "1.9.0"
                  }
                ],
                "source": "CPE_RANGE"
              },
              {
                "range": [
                  {
                    "fixed": "6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "range": [
                  {
                    "fixed": "891e3f10ae5989176211f8be35dcc7cd40aa92c6"
                  }
                ],
                "source": "REFERENCES_COMMIT"
              },
              {
                "original_tag": "v1.9.0",
                "range": [
                  {
                    "fixed": "e8d50bd7dc442fde1364291df9c429d1da91c0cb"
                  }
                ],
                "source": "REFERENCES_TAG"
              }
            ]
          },
          "events": [
            {
              "introduced": "fe87a117f941975793bf4063e9b08b90e88b230a"
            },
            {
              "fixed": "e8d50bd7dc442fde1364291df9c429d1da91c0cb"
            },
            {
              "fixed": "6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0"
            },
            {
              "fixed": "891e3f10ae5989176211f8be35dcc7cd40aa92c6"
            }
          ],
          "repo": "https://github.com/authlib/authlib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-x4rv-c3wx-4cr8"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-918"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/114xxx/CVE-2026-114620.json"
  },
  "details": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC 9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the abstract get_request_object() hook before applying a destination or registration policy; the hook itself performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who knows a valid public client identifier can make the authorization server request internal, link-local, or otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing. Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval limits are not affected. The JWTAuthenticationRequest implementation in authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.",
  "id": "CVE-2026-114620",
  "modified": "2026-11-01T02:30:35.183437533Z",
  "published": "2026-10-22T21:34:11.909Z",
  "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-2026-114620.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-114620"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/commit/6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/commit/891e3f10ae5989176211f8be35dcc7cd40aa92c6"
    },
    {
      "type": "FIX",
      "url": "https://github.com/authlib/authlib/pull/949"
    }
  ],
  "schema_version": "1.9.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Authlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRF"
}