CVE-2026-53776

CRITICAL EPSS 27.7%
Published Jun 16, 20262w ago · Modified Jun 17, 20262w ago
9.3 CVSS 4.0
Critical
Find Similar
Published Jun 16, 2026 2w ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.3
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
27.7% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-613

References 3

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.