## Authlib: Unvalidated request_uri fetch in JWT-secured authorization request (JAR) leading to SSRF

- 種別: advisory
- 重大度: medium
- 関連技術: python
- CVE: CVE-2026-114620
- 公開日時: 2026-10-27T15:39:18.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-x4rv-c3wx-4cr8)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-x4rv-c3wx-4cr8

影響: pip:authlib >= 1.6.0, < 1.9.0 → 1.9.0
Authlib's RFC 9101 (JAR) extension passes the attacker-controlled request_uri authorization parameter straight to the get_request_object() fetch hook with no validation, at a pre-authentication endpoint. Authlib already defines the pre-registration allowlist for this (request_uris client metadata and require_request_uri_registration server metadata) but the extension never consults it, and both docstrings instruct integrators to implement the hook as an unrestricted requests.get(request_uri). D…