CVE-2026-35039 fast-jwt Affected by Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup)

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 proce...

CVE-2026-35039 fast-jwt Affected by Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup)

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 proce...

CVE-2026-35039

CVE-2026-35039 — fast-jwt cacheKeyBuilder collision leads to identity/authorization mixups Multiple connected sources describe a cache-confusion vulnerability in fast-jwt where a user-supplied cacheKeyBuilder can fail to produce unique keys for different tokens. When caching is enabled, two disti...