CVE-2026-35039fast-jwt provides fast JSON Web Token (JWT) implementation.
Updated under an hour ago ()
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It affects nearform fast-jwt. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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fast-jwt provides fast JSON Web Token (JWT) implementation. From 0.0.1 to before 6.2.0, setting up a custom cacheKeyBuilder method which does not properly create unique keys for different tokens can lead to cache collisions. This could cause tokens to be mis-identified during the verification process leading to valid tokens returning claims from different valid tokens and users being mis-identified as other users based on the wrong token. Version 6.2.0 contains a patch.
- CVSS
- 9.1 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- Weakness (CWE)
- CWE-345, CWE-706, CWE-1289
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
nearform fast-jwt nearform:fast-jwt | from 0.1.0 before 6.1.0 | NVD |
References
- https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4cebpatch
- https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qgmitigation, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.