{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-53776: Perry < 0.5.1166 JWT Expiration Bypass via verify_decode","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-53776","status":"final","version":"1","initial_release_date":"2026-06-16T15:18:53.658Z","current_release_date":"2026-06-16T17:10:04.656Z","revision_history":[{"date":"2026-06-16T15:18:53.658Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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 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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-53776 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-53776"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-53776"},{"category":"external","summary":"github.com","url":"https://github.com/PerryTS/perry/releases/v0.5.1166"},{"category":"external","summary":"github.com","url":"https://github.com/PerryTS/perry/security/advisories/GHSA-5324-c68v-8w62"},{"category":"external","summary":"vulncheck.com","url":"https://www.vulncheck.com/advisories/perry-jwt-expiration-bypass-via-verify-decode"}]},"product_tree":{"branches":[{"category":"vendor","name":"PerryTS","branches":[{"category":"product_name","name":"perry","branches":[{"category":"product_version_range","name":"<0.5.1166","product":{"name":"PerryTS perry <0.5.1166","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:perryts:perry:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-53776","title":"Perry < 0.5.1166 JWT Expiration Bypass via verify_decode","notes":[{"category":"description","text":"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 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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","baseScore":9.3,"baseSeverity":"CRITICAL"},"products":["CSAFPID-1"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 0.5.1166.","product_ids":["CSAFPID-1"]}]}]}