CVE-2025-2559

MEDIUM

Keycloak - Denial of Service via JWT Token Cache Exhaustion

Title source: llm

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.

References (6)

Core 6

Core References

Issue Tracking issue-tracking x_refsource_redhat

https://bugzilla.redhat.com/show_bug.cgi?id=2353868

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:4335

Vendor Advisory vendor-advisory x_refsource_redhat

https://access.redhat.com/errata/RHSA-2025:4336

Vendor Advisory vdb-entry x_refsource_redhat

https://access.redhat.com/security/cve/CVE-2025-2559

https://github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca

View Patch ZIP pw:eip

https://github.com/keycloak/keycloak/issues/38576

Scores

CVSS v3 4.9

EPSS 0.0003

EPSS Percentile 7.3%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-770

Status published

Products (6)

org.keycloak/keycloak-services 0Maven

Red Hat/Red Hat Build of Keycloak

Red Hat/Red Hat build of Keycloak 26.0 26.0-12

Red Hat/Red Hat build of Keycloak 26.0 26.0-13

Red Hat/Red Hat build of Keycloak 26.0 26.0.11-2

Red Hat/Red Hat Single Sign-On 7

Published Mar 25, 2025

Tracked Since Feb 18, 2026