DEBIAN-CVE-2026-27962
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-27962
- Import Source
- https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-27962.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/DEBIAN-CVE-2026-27962
- Upstream
- Published
- 2026-03-16T18:16:07Z
- Modified
- 2026-09-11T18:47:36Z
- Severity
-
- 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Debian:12 / python-authlib
Package
- Name
- python-authlib
- Purl
- pkg:deb/debian/python-authlib?arch=source&distro=bookworm
Debian:13 / python-authlib
Package
- Name
- python-authlib
- Purl
- pkg:deb/debian/python-authlib?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Debian:14 / python-authlib
Package
- Name
- python-authlib
- Purl
- pkg:deb/debian/python-authlib?arch=source&distro=forky