6.5
CVE-2026-35041
- EPSS 0.26%
- Veröffentlicht 09.04.2026 16:16:27
- Zuletzt bearbeitet 14.04.2026 20:15:13
- Quelle security-advisories@github.com
- CVE-Watchlists
- Unerledigt
LoginReDoS in fast-jwt when using RegExp in allowed* leading to CPU exhaustion during token verification
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.
| Typ | Quelle | Score | Percentile |
|---|---|---|---|
| EPSS | FIRST.org | 0.26% | 0.173 |
| Quelle | Base Score | Exploit Score | Impact Score | Vector String |
|---|---|---|---|---|
| nvd@nist.gov | 6.5 | 2.8 | 3.6 |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
|
| security-advisories@github.com | 4.2 | 0.5 | 3.6 |
CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H
|
CWE-1333 Inefficient Regular Expression Complexity
The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.
https://github.com/nearform/fast-jwt/releases/tag/v6.2.1
https://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94
https://github.com/nearform/fast-jwt/pull/595
https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf