# CVE-2026-35039

## Summary

- **CVE ID:** CVE-2026-35039
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-345, CWE-706, CWE-1289
- **Published:** Apr 6, 2026
- **Last Modified:** May 13, 2026

## Description

fast-jwt provides fast JSON Web Token (JWT) implementation. From 0.0.1 to before 6.1.0, 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.

## Affected Products

- nearform — fast-jwt (>= 0.0.1, < 6.1.0)
- nearform — fast-jwt (>= 0.0.1, < 6.2.0)

## References

- [CNA](https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg)
- [CNA](https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4ceb)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.21%
- **EPSS Percentile:** 11.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._