9.1 CVE-2026-53776

Enriched by CISA
 

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.
https://nvd.nist.gov/vuln/detail/CVE-2026-53776

Categories

CWE-613 : Insufficient Session Expiration
According to WASC, "Insufficient Session Expiration is when a web site permits an attacker to reuse old session credentials or session IDs for authorization." Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.) Set sessions/credentials expiration date. JavaScript SDK does not set an expiration time for JWE tokens related to a session Web interface for a power quality analyzer uses tokens without an expiration date network traffic analyzer for PROFINET networks does not expire sessions AI/ML monitor for IT operations allows re-use of old session tokens due to insufficient session expiration

References


 

AFFECTED (from MITRE)

Vendor Product Versions
PerryTS perry
  • < 0.5.1166 [affected]
© 2022 The MITRE Corporation. This work is reproduced and distributed with the permission of The MITRE Corporation.

CPE

cpe start end

REMEDIATION


EXPLOITS

Exploit-db.com

id description date
No known exploits

POC Github

Url
No known exploits

Other Nist (github, ...)

Url
No known exploits

CAPEC

Common Attack Pattern Enumerations and Classifications

id description severity
No entry