fast-jwt Known Vulnerabilities & Fixes
fast-jwt has 4 known security vulnerabilities in npm (Node.js). Upgrade to version 6.3.0 or later to resolve all known issues. Data sourced from OSV, enriched with EPSS exploit probability and CISA KEV.
Low Immediate Risk
No actively exploited vulnerabilities detected. Monitor and update in your next maintenance window.
Recommended safe version: 6.3.0
Upgrading to 6.3.0 or later resolves all 4 known vulnerabilities in fast-jwt. Run: npm install fast-jwt@6.3.0
Is fast-jwt in your project?
Check if you're affected and upgrade to 6.3.0 to stay secure.
Security Summary
- 4 affected version ranges have been identified across these 4 advisories.
- 100% of known issues have a published fixed version.
- Remediation: npm update fast-jwt
Vulnerabilities
4 unique vulnerabilities — sorted by exploitation risk (KEV → EPSS → CVSS). Click a CVE/GHSA ID for full details. First disclosed Apr 2, 2026, most recently Oct 8, 2026 (189 days apart).
| CVE / GHSA | Severity | Affected | Fixed In |
|---|---|---|---|
| CVE-2026-107722 fast-jwt: Incomplete patch of CVE-2026-34950: Non-whitespace key-prefix re-enables RSA→HS256 algorithm confusion | CRITICAL | All versions | 6.3.0 |
| CVE-2026-44351 fast-jwt: JWT auth bypass due to empty HMAC secret accepted by async key resolver | CRITICAL | All versions | 6.2.4 |
| CVE-2026-35039 fast-jwt: Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup) | CRITICAL | All versions | 6.2.0 |
| CVE-2026-34950 fast-jwt: Incomplete fix for CVE-2023-48223: JWT Algorithm Confusion via Whitespace-Prefixed RSA Public Key | CRITICAL | All versions | 6.2.0 |
About This Data
Vulnerability data for fast-jwt is sourced from the Open Source Vulnerability (OSV) database, aggregating reports from GitHub Advisory Database, NIST NVD, and ecosystem-specific sources.
CVSS (Common Vulnerability Scoring System) scores reflect exploitability and impact. EPSS (Exploit Prediction Scoring System) scores indicate the probability of exploitation within the next 30 days. Vulnerabilities marked with are listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
Related npm (Node.js) Packages
Other packages in this ecosystem, ranked by shared vulnerabilities where available.
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