fast-jwt: Verifier cache accepts expired JWTs without iat.

Summary cacheSet only derives its exp cache deadline inside hasIat src/verifier.js:127-140. JWT iat is optional. For a valid token with exp but no iat, cacheSet substitutes clockTimestamp + clockTolerance + cacheTTL src/verifier.js:142-146. Later, the cache path returns the saved payload before...

GHSA-X937-HJ6V-793P fast-jwt: Verifier cache accepts expired JWTs without iat.

Summary cacheSet only derives its exp cache deadline inside hasIat src/verifier.js:127-140. JWT iat is optional. For a valid token with exp but no iat, cacheSet substitutes clockTimestamp + clockTolerance + cacheTTL src/verifier.js:142-146. Later, the cache path returns the saved payload before...

PT-2026-108687

Summary cacheSet only derives its exp cache deadline inside hasIat src/verifier.js:127-140. JWT iat is optional. For a valid token with exp but no iat, cacheSet substitutes clockTimestamp + clockTolerance + cacheTTL src/verifier.js:142-146. Later, the cache path returns the saved payload before...

PT-2026-108248

Name of the Vulnerable Software and Affected Versions fast-jwt versions prior to 6.3.4 Description An expiration-check bypass exists when caching is enabled. The createVerifier cache may continue accepting a signed JSON Web Token JWT after its expiration time if the token contains an exp expirati...

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