{"id":"CVE-2026-107721","revision":"cc9ceb450af54e51b7806686e9c66bc0","records":[{"revision":"cc9ceb450af54e51b7806686e9c66bc0","observedAt":"2026-10-25T05:17:13.11+00:00","statement":{"source":"nvd","id":"CVE-2026-107721","aliases":[],"title":"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, …","description":"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 comparisons always pass, allowing expired or not-yet-active tokens to be accepted. The verifier cache also derives infinite bounds, so entries created under this configuration can remain valid until eviction. Exploitation requires an application administrator or equivalent configuration path to set clockTolerance to Infinity. This issue is fixed in version 6.3.0.","state":0,"publishedAt":"2026-10-08T22:17:28.263+00:00","modifiedAt":"2026-10-09T16:17:23.59+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N","score":5.9,"severity":"MEDIUM"}],"references":["https://github.com/nearform/fast-jwt/commit/c0fb5b88b4c88ff2bdd194ca2c713599ad9e38b6","https://github.com/nearform/fast-jwt/releases/tag/v6.3.0","https://github.com/nearform/fast-jwt/security/advisories/GHSA-687g-22h4-j4w4"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-107721","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-613","CWE-682"],"productCriteria":[],"sourceDates":{"published":"2026-10-08T22:17:28.263","lastModified":"2026-10-09T16:17:23.590"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-107721","identifiers":["CVE-2026-107721"]},"retained":false,"historicalAffected":[]}],"coverage":[]}