{"id":"CVE-2026-53776","title":"Perry < 0.5.1166 JWT Expiration Bypass via verify_decode","summary":"Perry before 0.5.1166 contains a JWT validation vulnerability that allows remote attackers to bypass token expiration by exploiting the unconditional setting of validate_exp = false in the verify_decode helper within the stdlib JWT verif…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-613"],"vendor":"PerryTS","product":"perry","affected":["perry < 0.5.1166"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-06-16T17:04:20.295770Z"},"published":"2026-06-16","updated":"2026-11-08","sourceUpdated":"2026-11-08T14:05:03.490Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53776","references":[{"url":"https://github.com/PerryTS/perry/releases/v0.5.1166"},{"url":"https://github.com/PerryTS/perry/security/advisories/GHSA-5324-c68v-8w62","label":"GitHub Security Advisory (GHSA-5324-c68v-8w62)"},{"url":"https://www.vulncheck.com/advisories/perry-jwt-expiration-bypass-via-verify-decode"}],"tags":["cve.org"],"epss":0.00357,"epssPercentile":0.2971,"ingestedAt":"2026-11-08T14:51:22.379Z","slug":"CVE-2026-53776","body":"## Overview\n\nPerry before 0.5.1166 contains a JWT validation vulnerability that allows remote attackers to bypass token expiration by exploiting the unconditional setting of validate_exp = false in the verify_decode helper within the stdlib JWT verification path. Attackers in possession of a previously issued bearer token can present expired tokens to any jwt.verify() call and retain authenticated access indefinitely, bypassing force-expired sessions such as user logout or administrative revocation.\n\n## Affected\n\n- `perry < 0.5.1166`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}