CVE-2026-53776
Perry < 0.5.1166 JWT Expiration Bypass via verify_decode
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-613 |
| Vendor | perryts |
| Product | perry |
| Published | Jun 16, 2026 |
| Last Updated | Jun 16, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Affected Versions
PerryTS / perry
0 < 0.5.1166
References
Credits
Katriel Moses VulnCheck