Is fast-jwt affected by CVE-2026-35042?

npm fast-jwt is affected in <=6.1.0.

Is CVE-2026-35042 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

high

CVE-2026-35042

Q: Is CVE-2026-35042 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.2%.

npm · fast-jwt

Summary

fast-jwt accepts unknown `crit` header extensions (RFC 7515 violation)

Severity: high
EPSS: 0.2% (p5)
Also known as: GHSA-hm7r-c7qw-ghp6
Published: 2026-04-03

References

https://github.com/nearform/fast-jwt/security/advisories/GHSA-hm7r-c7qw-ghp6
https://nvd.nist.gov/vuln/detail/CVE-2026-35042
https://github.com/advisories/GHSA-9ggr-2464-2j32

Related advisories

CVE-2026-44351 — critical · npm/fast-jwt
CVE-2026-35039 — critical · npm/fast-jwt
CVE-2026-34950 — critical · npm/fast-jwt
CVE-2026-35041 — medium · npm/fast-jwt
CVE-2026-35040 — medium · npm/fast-jwt

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.