CVE-2026-35041
MEDIUM SEVERITYCVSS Score & Metrics
Base Score
4.2 / 10
Vector String
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
Vulnerability Description
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.
Vulnerability Details
Published Date
Last Modified
CWE ID
CWE-1333
Source
NVD
Vendor
nearform
Product
fast-jwt
External 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://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf
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