CVE-2026-27962Authlib JWS JWK Header Injection: Signature Verification Bypass
Beschreibung
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.
Daten: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Wiedergegeben wie in der Quelle, auf Englisch.
Betroffene Produkte und Versionen
| Hersteller | Produkt | Versionen | |
|---|---|---|---|
| authlib | authlib | < 1.6.9 | |
| quay | 3.10 | — | |
| quay | 3.14 | — | |
| quay | 3.15 | — | |
| quay | 3.16 | — | |
| quay | 3.18 | — | |
| Red Hat | Lightspeed Core | — | |
| Red Hat | Red Hat Ansible Automation Platform 2 | — | |
| Red Hat | Red Hat OpenShift AI (RHOAI) | — | |
| Red Hat | Red Hat Quay 3.10 | all versions | |
| Red Hat | Red Hat Quay 3.14 | all versions | |
| Red Hat | Red Hat Quay 3.15 | all versions | |
| Red Hat | Red Hat Quay 3.16 | all versions | |
| Red Hat | Red Hat Quay 3.18 | all versions | |
| Red Hat | Red Hat Satellite 6 | — |
Referenzen und Patches
- https://github.com/authlib/authlib/security/advisories/GHSA-wvwj-cvrp-7pv5 ExploitMitigationVendor Advisory
- https://github.com/authlib/authlib/commit/a5d4b2d4c9e46bfa11c82f85fdc2bcc0b50ae681 Patch
- https://github.com/authlib/authlib/releases/tag/v1.6.9 ProductRelease Notes
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:24853
- https://access.redhat.com/errata/RHSA-2026:48085
- https://access.redhat.com/errata/RHSA-2026:5665
- https://access.redhat.com/errata/RHSA-2026:7314
- https://access.redhat.com/security/cve/CVE-2026-27962
- https://bugzilla.redhat.com/show_bug.cgi?id=2448164
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27962.json
CPE-Treffer (NVD) (1)
cpe:2.3:a:authlib:authlib:*:*:*:*:*:*:*:*< 1.6.9