vulnerability · Thu 08 Oct 2026 · 22:02 UTC
GHSA-ww5h-9m49-7xx4: fast-jwt: Incomplete patch of CVE-2026-34950: Non-whitespace key-prefix re-enables RSA→HS256 algorithm
Filed UTCSource GTH ↗
The fix for CVE-2026-34950 (CVSS 9.1, released in v6.2.0) is incomplete. It adds key.trim() to the PEM-detection path in src/crypto.js, but String.prototype.trim() only strips characters classified as whitespace by the ECMAScript specification. The subsequent ^-anchored regex (`/^-----BEGIN(?: (RSA))? …
Signals
as the pipeline stamped them- High
- Critical vulnerability — CVSS 9.8
- What to do
- Critical severity — schedule an urgent patch.
CVE
KEV from CISA · EPSS from FIRST| Id | KEV | EPSS | Reference |
|---|---|---|---|
| CVE-2026-107722 | — | 0.27% | NVD ↗ |
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