Perry < 0.5.1166 JWT Expiration Bypass via verify_decode_CVE-2026-53776

9.3 / 10

CRITICAL

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

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.

AI Analysis

JWT validation vulnerability allowing attackers to bypass token expiration

Basic Information

ID CVE-2026-53776

Source VulnCheck

Published Jun 16, 2026 at 15:18

Affected Product

Vendor PerryTS

Product perry

Affected Versions PerryTS perry 0

CWE Classification

CWE-613

AI Assessment

AI Score 9.3 / 10

AI Severity Critical

Vendor PerryTS

Product Perry

Version 0.5.1166

References

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    "published": "2026-06-16T15:18:53.658Z",
    "modified": "2026-06-16T15:18:53.658Z",
    "type": "cve",
    "title": "Perry < 0.5.1166 JWT Expiration Bypass via verify_decode",
    "source": "VulnCheck",
    "references": "https://github.com/PerryTS/perry/releases/v0.5.1166\nhttps://github.com/PerryTS/perry/security/advisories/GHSA-5324-c68v-8w62\nhttps://www.vulncheck.com/advisories/perry-jwt-expiration-bypass-via-verify-decode",
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    "sourceData": "PerryTS perry 0",
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    "cvss": {
        "score": 9.3,
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    "product": "perry",
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