Vulnerability Details CVE-2026-35039
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 1.3%
CVSS Severity
CVSS v3 Score 9.1
References
Products affected by CVE-2026-35039
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cpe:2.3:a:nearform:fast-jwt:0.1.0
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cpe:2.3:a:nearform:fast-jwt:0.1.1
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cpe:2.3:a:nearform:fast-jwt:0.2.0
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cpe:2.3:a:nearform:fast-jwt:0.3.0
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cpe:2.3:a:nearform:fast-jwt:0.3.1
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cpe:2.3:a:nearform:fast-jwt:0.4.0
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cpe:2.3:a:nearform:fast-jwt:0.4.1
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cpe:2.3:a:nearform:fast-jwt:0.4.2
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cpe:2.3:a:nearform:fast-jwt:0.5.0
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cpe:2.3:a:nearform:fast-jwt:0.5.1
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cpe:2.3:a:nearform:fast-jwt:1.0.0
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cpe:2.3:a:nearform:fast-jwt:1.1.0
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cpe:2.3:a:nearform:fast-jwt:1.1.1
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cpe:2.3:a:nearform:fast-jwt:1.1.2
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cpe:2.3:a:nearform:fast-jwt:1.1.3
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cpe:2.3:a:nearform:fast-jwt:1.2.0
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cpe:2.3:a:nearform:fast-jwt:1.3.0
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cpe:2.3:a:nearform:fast-jwt:1.3.1
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cpe:2.3:a:nearform:fast-jwt:1.3.2
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cpe:2.3:a:nearform:fast-jwt:1.4.0
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cpe:2.3:a:nearform:fast-jwt:1.4.1
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cpe:2.3:a:nearform:fast-jwt:1.5.0
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cpe:2.3:a:nearform:fast-jwt:1.5.1
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cpe:2.3:a:nearform:fast-jwt:1.5.2
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cpe:2.3:a:nearform:fast-jwt:1.5.3
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cpe:2.3:a:nearform:fast-jwt:1.5.4
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cpe:2.3:a:nearform:fast-jwt:1.6.0
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cpe:2.3:a:nearform:fast-jwt:1.6.1
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cpe:2.3:a:nearform:fast-jwt:1.7.0
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cpe:2.3:a:nearform:fast-jwt:1.7.1
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cpe:2.3:a:nearform:fast-jwt:1.7.2
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cpe:2.3:a:nearform:fast-jwt:2.0.0
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cpe:2.3:a:nearform:fast-jwt:2.0.2
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cpe:2.3:a:nearform:fast-jwt:2.1.0
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cpe:2.3:a:nearform:fast-jwt:2.2.0
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cpe:2.3:a:nearform:fast-jwt:2.2.1
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cpe:2.3:a:nearform:fast-jwt:2.2.2
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cpe:2.3:a:nearform:fast-jwt:2.2.3
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cpe:2.3:a:nearform:fast-jwt:3.0.0
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cpe:2.3:a:nearform:fast-jwt:3.1.0
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cpe:2.3:a:nearform:fast-jwt:3.1.1
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cpe:2.3:a:nearform:fast-jwt:3.2.0
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cpe:2.3:a:nearform:fast-jwt:3.3.0
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cpe:2.3:a:nearform:fast-jwt:3.3.1
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cpe:2.3:a:nearform:fast-jwt:3.3.2
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cpe:2.3:a:nearform:fast-jwt:3.3.3
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cpe:2.3:a:nearform:fast-jwt:4.0.0
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cpe:2.3:a:nearform:fast-jwt:4.0.1
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cpe:2.3:a:nearform:fast-jwt:4.0.2
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cpe:2.3:a:nearform:fast-jwt:4.0.3
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cpe:2.3:a:nearform:fast-jwt:4.0.5
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cpe:2.3:a:nearform:fast-jwt:4.0.6
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cpe:2.3:a:nearform:fast-jwt:5.0.0
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cpe:2.3:a:nearform:fast-jwt:5.0.1
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cpe:2.3:a:nearform:fast-jwt:5.0.2
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cpe:2.3:a:nearform:fast-jwt:5.0.5
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cpe:2.3:a:nearform:fast-jwt:5.0.6
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cpe:2.3:a:nearform:fast-jwt:6.0.0
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cpe:2.3:a:nearform:fast-jwt:6.0.1
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cpe:2.3:a:nearform:fast-jwt:6.0.2