Medium 6.5Published Apr 9, 2026

CVE-2026-35041fast-jwt provides fast JSON Web Token (JWT) implementation.

Updated under an hour ago (2026-10-19 09:50 UTC)

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It affects nearform fast-jwt. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for nearform fast-jwt

Exploited in the last 30 days

fast-jwt provides fast JSON Web Token (JWT) implementation. From 5.0.0 to 6.2.0, a denial-of-service condition exists in fast-jwt when the allowedAud verification option is configured using a regular expression. Because the aud claim is attacker-controlled and the library evaluates it against the supplied RegExp, a crafted JWT can trigger catastrophic backtracking in the JavaScript regex engine, resulting in significant CPU consumption during verification. This vulnerability is fixed in 6.2.1.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-1333
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

nearform fast-jwt nearform:fast-jwt	from 5.0.0 before 6.2.1	NVD

References

https://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94patch
https://github.com/nearform/fast-jwt/pull/595issue-tracking, patch
https://github.com/nearform/fast-jwt/releases/tag/v6.2.1product, release-notes
https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxfexploit, mitigation, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.