CVE catalog
CVE-2026-35041
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
- Severity
- Medium · CVSS 4.2
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.26% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | fast-jwt | Not reported | 6.2.1 | fixed |
| Cpe | fast-jwt | Not reported | 6.2.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | fast-jwt | cpe | Not reported | 6.2.1 | Not reported | Not reported | Not reported |
| Cpe | fast-jwt | cpe | Not reported | 6.2.1 | Not reported | NVD-CVE-2026-35041 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94]
- [https://github.com/nearform/fast-jwt/pull/595]
- [https://github.com/nearform/fast-jwt/releases/tag/v6.2.1]
- [https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-35041]