CVE-2026-53776

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.

References

https://www.vulncheck.com/advisories/perry-jwt-expiration-bypass-via-verify-decode

https://github.com/PerryTS/perry/security/advisories/GHSA-5324-c68v-8w62

https://github.com/PerryTS/perry/releases/v0.5.1166

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4