{"id":"CVE-2026-35039","revision":"bfc4b4b0ee9745868b5d18ad54f787b3","records":[{"revision":"bfc4b4b0ee9745868b5d18ad54f787b3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-35039","aliases":[],"title":"fast-jwt Affected by Cache Confusion via cacheKeyBuilder Collisions Can Return Claims From a Different Token (Identity/Authorization Mixup)","description":"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.","state":0,"publishedAt":"2026-04-06T16:59:43.124+00:00","modifiedAt":"2026-05-13T15:12:43.989+00:00","affected":[{"ecosystem":"Vendor product","name":"fast-jwt","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"nearform\",\n                    \"product\": \"fast-jwt\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.0.1, < 6.2.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg","https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4ceb"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-35039","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-35039","identifiers":["CVE-2026-35039"]},"retained":false,"historicalAffected":[]}],"coverage":[]}