fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set
High-risk advisory
CVE-2026-107720
Summary
fast-jwt: createVerifier accepts unsigned JWTs when key is '' or null and algorithms is explicitly set
Why it matters
GitHub has published a reviewed security advisory for fast-jwt. Prioritize it with other application dependency updates, especially because EPSS places it in the 16% percentile.
Operator check
Check whether fast-jwt is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. EPSS probability: 0.3%; percentile: 16%.
Sources
PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.