Critical severity9.1NVD Advisory· Published Apr 6, 2026· Updated Apr 22, 2026
CVE-2026-35039
CVE-2026-35039
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
fast-jwtnpm | >= 0.0.1, < 6.2.0 | 6.2.0 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4cebnvdPatchWEB
- github.com/advisories/GHSA-rp9m-7r4c-75qgghsaADVISORY
- github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qgnvdMitigationVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-35039ghsaADVISORY
News mentions
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