Vulnerability in Nearform Fast-jwt
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 expression. Because the aud claim is at…
Vulnerability class: ReDoS (Regular Expression Denial of Service)
EPSS: 0.000 (15.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H.
Affected products
- Nearform Fast-jwt — versions >= 5.0.0, < 6.2.1
Weakness classification (CWE)
References
- https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf (x_refsource_CONFIRM)
- https://github.com/nearform/fast-jwt/pull/595 (x_refsource_MISC)
- https://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94 (x_refsource_MISC)
- https://github.com/nearform/fast-jwt/releases/tag/v6.2.1 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-35041?
- CVE-2026-35041 is a medium-severity vulnerability in Nearform Fast-jwt, classified under Inefficient Regular Expression Complexity. CVSS score: 4.2/10. Published 2026-04-09.
- How severe is CVE-2026-35041?
- Medium severity. CVSS v3 base score is 4.2 out of 10.