Resource exhaustion in Red Hat Build Of Keycloak
CVE-2025-2559
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (51.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: +0.000
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.0 — versions 26.0.11-2, 26.0-12, 26.0-13
- Red Hat Single Sign-On 7
Weakness classification (CWE)
References
- access.redhat.com/errata/RHSA-2025:4335 (vendor-advisory)
- access.redhat.com/errata/RHSA-2025:4336 (vendor-advisory)
- access.redhat.com/security/cve/CVE-2025-2559 (vdb-entry)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking)
- github.com/keycloak/keycloak/commit/a10c8119d4452b866b90a9019b2cc159919276ca
- github.com/keycloak/keycloak/issues/38576
Frequently asked questions
- What is CVE-2025-2559?
- CVE-2025-2559 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 4.9/10. Published 2025-03-25.
- How severe is CVE-2025-2559?
- Medium severity. CVSS v3 base score is 4.9 out of 10.