CVE-2026-53776

critical · 9.3

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.

9.3

CVSS

0.4%

EPSS (exploit prob.)

30th

EPSS percentile

2026-06-16

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-613

References

https://github.com/PerryTS/perry/releases/v0.5.1166
https://github.com/PerryTS/perry/security/advisories/GHSA-5324-c68v-8w62
https://www.vulncheck.com/advisories/perry-jwt-expiration-bypass-via-verify-decode

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-53776