CVE-2026-27962

01/תיאור (מקור, אנגלית)

Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a JWK Header Injection vulnerability in authlib's JWS implementation allows an unauthenticated attacker to forge arbitrary JWT tokens that pass signature verification. When key=None is passed to any JWS deserialization function, the library extracts and uses the cryptographic key embedded in the attacker-controlled JWT jwk header field. An attacker can sign a token with their own private key, embed the matching public key in the header, and have the server accept the forged token as cryptographically valid — bypassing authentication and authorization entirely. This issue has been patched in version 1.6.9.

02/מוצרים מושפעים

authlib: authlib

03/קישורים10

• github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-‮… ExploitMitigationVendor Advisory
• github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2‮… Patch
• github.com/authlib/authlib/releases/tag/v1.6.9 ProductRelease Notes
• access.redhat.com/errata/RHSA-2026:19375
• access.redhat.com/errata/RHSA-2026:24853
• access.redhat.com/errata/RHSA-2026:48085
• access.redhat.com/errata/RHSA-2026:5665
• access.redhat.com/errata/RHSA-2026:7314
• access.redhat.com/security/cve/CVE-2026-27962
• bugzilla.redhat.com/show_bug.cgi?id=2448164