{"action":"Upgrade fast-jwt to 6.2.1 or later.","affected":[{"fixed":"6.2.1","introduced":"0"}],"component":"fast-jwt","cve_ids":["CVE-2026-35040"],"ecosystem":"npm","epss":0.00383,"exploited":false,"fixed_versions":["6.2.1"],"ghsa_id":"GHSA-3j8v-cgw4-2g6q","id":"tcs_01M5KEXJ85M1V07ZDPN9XF4CWW","modified_at":"2026-04-09T19:17:26.846555Z","published_at":"2026-04-09T16:41:20Z","references":["https://osv.dev/vulnerability/GHSA-3j8v-cgw4-2g6q","https://github.com/nearform/fast-jwt/security/advisories/GHSA-3j8v-cgw4-2g6q","https://nvd.nist.gov/vuln/detail/CVE-2026-35040","https://github.com/nearform/fast-jwt/pull/593","https://github.com/nearform/fast-jwt/commit/18d25904e4617e8753526d1b3ab5a2cccdea726a","https://github.com/nearform/fast-jwt","https://github.com/nearform/fast-jwt/releases/tag/v6.2.1"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-3j8v-cgw4-2g6q","url":"https://osv.dev/vulnerability/GHSA-3j8v-cgw4-2g6q"}],"summary":"fast-jwt: Stateful RegExp (/g or /y) causes non-deterministic allowed-claim validation (logical DoS)"}