Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)
High-risk advisory
CVE-2026-114616
Summary
Authlib accepts an empty HMAC key, allowing JWS/JWT signature forgery (HS256/HS384/HS512)
Why it matters
GitHub has published a reviewed security advisory for Authlib. Prioritize it with other application dependency updates, especially because EPSS places it in the 11% percentile.
Operator check
Check whether Authlib is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.2%; percentile: 11%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.