python-authlib: Authlib is a Python library which builds OAuth and OpenID Connect servers
CVE-2026-114615 is fixed in python-authlib on 1 platform by DEBIAN-CVE-2026-114615 (version 1.9.1-1), released October 31, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
Authlib is a Python library which builds OAuth and OpenID Connect servers. From 1.3.1 until 1.9.0, OctKey.import_key() checks asymmetric-key markers only at byte zero while Authlib's PEM loaders accept leading whitespace, comments, or a byte-order mark. In deployments that use the documented mixed algorithm registry and already configure verification with PEM or certificate bytes containing such a prefix, an unauthenticated attacker who knows those same public-key bytes can use them as an HMAC secret and forge HS256 tokens with arbitrary identity or authorization claims. This is a bypass of the remediation for CVE-2024-37568. The module-level jwt object reaches OctKey.import_key() in authlib/jose/rfc7518/oct_key.py, where POSSIBLE_UNSAFE_KEYS fails to identify prefixed asymmetric key material. This issue is fixed in version 1.9.0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| python-authlib · Debian 14 | 1.9.1-1 | DEBIAN-CVE-2026-114615 | Oct 31, 2026 |
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