Home

Description

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.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-16 | Updated 2026-06-16 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Problem types

Insufficient Session Expiration

Product status

Default status
affected

Any version before 0.5.1166
affected

Credits

Katriel Moses finder

VulnCheck finder

References

github.com/PerryTS/perry/releases/v0.5.1166 release-notes

github.com/.../perry/security/advisories/GHSA-5324-c68v-8w62 vendor-advisory

www.vulncheck.com/...jwt-expiration-bypass-via-verify-decode third-party-advisory

cve.org (CVE-2026-53776)

nvd.nist.gov (CVE-2026-53776)

Download JSON