{"schema":"threatline.record/2","record":{"id":"CVE-2026-114620","aliases":["GHSA-x4rv-c3wx-4cr8"],"summary":"Authlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRF","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.","categories":["Unclassified"],"product":"authlib","vendor":"authlib","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-114620","source_modified_at":"2026-10-22T21:34:11.909Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"authlib","vendor":"authlib","versions":[{"status":"affected","version":"< 1.9.0"}],"defaultStatus":null},{"source":"GitHub Advisory Database","source_url":"https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8","source_modified_at":"2026-10-22T21:33:33Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"authlib","ecosystem":null},"range":">=1.6.0,<1.9.0"}],"fixed_versions":[{"source":"GitHub Advisory Database","source_url":"https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8","source_modified_at":"2026-10-22T21:33:33Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"authlib","ecosystem":null},"version":"1.9.0"}],"cvss":5.4,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.0029,"percentile":0.20454,"score_date":"2026-10-23"},"published_at":"2026-10-22T21:34:11.909Z","modified_at":"2026-10-22T21:34:11.909Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-114620","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-22T21:34:11.909Z"},{"source":"GitHub Advisory Database","url":"https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-22T21:33:33Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-114620","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/authlib/authlib/pull/949","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/authlib/authlib/commit/6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/authlib/authlib/commit/891e3f10ae5989176211f8be35dcc7cd40aa92c6","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/authlib/authlib/releases/tag/v1.9.0","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-22T21:34:11.909Z","content_hash":"3c9ea8ab69269f6abadabd7c300cdda8561d5d3cdc084b0f2f1019fdc37ae93e"}}