Riskcovery

CVE-2026-79651

Keycloak-services: keycloak-services: unauthenticated dos via unbounded locale caching

State
Published
Severity
7.5 High
Published
Sep 16, 2026
Updated
Sep 25, 2026
Reserved
Aug 25, 2026

Read the record on cve.org

Description

A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak. The issue occurs because the system accepts arbitrary locale tags from unauthenticated requests and stores them in a permanent in-memory cache without limits. An attacker can exploit this by sending a large number of unique locale tags, eventually causing the server to run out of memory and crash.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hredhat

Weaknesses

  • CWE-400 Uncontrolled Resource Consumption

Affected Products

ProductVersions
Red Hat build of Keycloak 26.4Red Hat
  • 26.4.16-2 and laterNot affected
Red Hat build of Keycloak 26.4Red Hat
  • 26.4-26 and laterNot affected
Red Hat build of Keycloak 26.4Red Hat
  • 26.4-26 and laterNot affected
Red Hat build of Keycloak 26.4.16Red Hat
    Red Hat build of Keycloak 26.4.16Red Hat
      Red Hat build of Keycloak 26.4.16Red Hat
        Red Hat build of Keycloak 26.6Red Hat
        • 26.6.7-3 and laterNot affected
        Red Hat build of Keycloak 26.6Red Hat
        • 26.6-20 and laterNot affected
        Red Hat build of Keycloak 26.6Red Hat
        • 26.6-20 and laterNot affected
        Red Hat build of Keycloak 26.6.7Red Hat
          Red Hat build of Keycloak 26.6.7Red Hat
            Red Hat build of Keycloak 26.6.7Red Hat
              Red Hat Single Sign-On 7Red Hat

                References

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