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Advisory severityMedium4.9Red Hat Linux

Medium [CVE-2025-2559] Org.keycloak/keycloak-services: jwt token cache exhaustion leading to denial of service (dos) in keycloak

This medium-severity Red Hat Linux advisory covers CVE-2025-2559 affecting Red Hat build of Keycloak 26.0, Red Hat Single Sign-On 7.

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CVE-2025-2559 Source published Source updated

VulniPulse record published

CVE-2025-2559
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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Summary

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.

Red Hat severity: Moderate — CVSS 4.9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.

Affected Red Hat products: Red Hat Build of Keycloak; Red Hat build of Keycloak 26.0; Red Hat Single Sign-On 7. Red Hat fixing advisory: RHSA-2025:4336, RHSA-2025:4335.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 23 days ago·verify at source

Fixed versions
  • keycloak-services
  • rhbk/keycloak-operator-bundle:26.0.11-2
  • rhbk/keycloak-rhel9:26.0-12
  • rhbk/keycloak-rhel9-operator:26.0-13
  • RHSA-2025:4336
  • RHSA-2025:4335

Official advisory · high-confidence parse· fetched 23 days ago·verify at source

Mitigation

Upgrade to a fixed release: keycloak-services, rhbk/keycloak-operator-bundle:26.0.11-2, rhbk/keycloak-rhel9:26.0-12, rhbk/keycloak-rhel9-operator:26.0-13, RHSA-2025:4336, RHSA-2025:4335. That is the remediation for this advisory.

The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.

Official advisory · high-confidence parse· fetched 23 days ago·verify at source

Discussion(0)

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