CVE-2025-2559 Information

Description

A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time for example 24 or 48 hours the cache can grow indefinitely leading to an OutOfMemoryError. This issue could result in a denial of service condition preventing legitimate users from accessing the system.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Reference

https://access.redhat.com/security/cve/CVE-2025-2559 https://bugzilla.redhat.com/show_bug.cgi?id=2353868

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction Required

HIGH

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

4.9