{"id":"CVE-2026-35039","sourceIdentifier":"security-advisories@github.com","published":"2026-04-06T17:17:13.243","lastModified":"2026-10-23T23:10:00.157","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"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."},{"lang":"es","value":"pendiente..."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"nearform","product":"fast-jwt","versions":[{"version":">= 0.0.1, < 6.2.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":9.1,"baseSeverity":"CRITICAL","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":5.2}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-07T14:25:32.378641Z","id":"CVE-2026-35039","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-345"},{"lang":"en","value":"CWE-706"},{"lang":"en","value":"CWE-1289"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*","versionStartIncluding":"0.1.0","versionEndExcluding":"6.1.0","matchCriteriaId":"9B0182D1-3EBD-449D-91F1-DE0E6B616CE4"}]}]}],"references":[{"url":"https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4ceb","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg","source":"security-advisories@github.com","tags":["Mitigation","Vendor Advisory"]}]}