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: 0.003 (17.8th 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
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
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.