CVE-2026-107721

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.3.0, fast-jwt createVerifier accepts Infinity for clockTolerance because its option validation checks type and negativity but not finiteness. In validateClaimDateValue, infinite positive and negative modifiers make exp and nbf...

fast-jwt clockTolerance: Infinity silently bypasses both exp and nbf validation (and persists in the verifier cache)

Summary createVerifier clockTolerance: Infinity silently bypasses both exp expiry AND nbf not-before validation. Any expired or not-yet-active token is accepted as valid. The same primitive also corrupts the verifier's internal cache so cached entries inherit infinite validity — they remain valid...

GHSA-687G-22H4-J4W4 fast-jwt clockTolerance: Infinity silently bypasses both exp and nbf validation (and persists in the verifier cache)

Summary createVerifier clockTolerance: Infinity silently bypasses both exp expiry AND nbf not-before validation. Any expired or not-yet-active token is accepted as valid. The same primitive also corrupts the verifier's internal cache so cached entries inherit infinite validity — they remain valid...

Insufficient Session Expiration

Overview fast-jwt is a Fast JSON Web Token implementation Affected versions of this package are vulnerable to Insufficient Session Expiration in src/verifier.js when the clockTimestamp, clockTolerance, or cacheTTL verifier options are set to non-finite values such as Infinity or NaN. The previous...

CVE-2026-107721 fast-jwt clockTolerance: Infinity silently bypasses both exp and nbf validation (and persists in the verifier cache)

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.3.0, fast-jwt createVerifier accepts Infinity for clockTolerance because its option validation checks type and negativity but not finiteness. In validateClaimDateValue, infinite positive and negative modifiers make exp and nbf...

CVE-2026-107721 fast-jwt clockTolerance: Infinity silently bypasses both exp and nbf validation (and persists in the verifier cache)

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.3.0, fast-jwt createVerifier accepts Infinity for clockTolerance because its option validation checks type and negativity but not finiteness. In validateClaimDateValue, infinite positive and negative modifiers make exp and nbf...

CVE-2026-107721

The fast-jwt library, prior to version 6.3.0 , contains a vulnerability where setting clockTolerance to Infinity bypasses both exp (expiration) and nbf (not before) validations. This occurs because the createVerifier function fails to check for finiteness during option validation. Consequently, t...

CVE-2026-107721

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.3.0, fast-jwt createVerifier accepts Infinity for clockTolerance because its option validation checks type and negativity but not finiteness. In validateClaimDateValue, infinite positive and negative modifiers make exp and nbf...

CVE-2026-107721 fast-jwt clockTolerance: Infinity silently bypasses both exp and nbf validation (and persists in the verifier cache)

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.3.0, fast-jwt createVerifier accepts Infinity for clockTolerance because its option validation checks type and negativity but not finiteness. In validateClaimDateValue, infinite positive and negative modifiers make exp and nbf...

PT-2026-108634

Summary createVerifier clockTolerance: Infinity silently bypasses both exp expiry AND nbf not-before validation. Any expired or not-yet-active token is accepted as valid. The same primitive also corrupts the verifier's internal cache so cached entries inherit infinite validity — they remain valid...

PT-2026-108250

Name of the Vulnerable Software and Affected Versions fast-jwt versions 1.5.1 through 6.2.x Description The createVerifier function fails to properly validate the clockTolerance option, accepting Infinity as a valid input. This occurs because the validation logic only checks if the value is a...

CVE-2026-107721: Insufficient Session Expiration

fast-jwt provides fast JSON Web Token JWT implementation. Prior to 6.3.0, fast-jwt createVerifier accepts Infinity for clockTolerance because its option validation checks type and negativity but not finiteness. In validateClaimDateValue, infinite positive and negative modifiers make exp and nbf...