Vulnerability in Red Hat Build of Keycloak

[ Description ]Official description

A flaw was found in the Micrometer user-event metrics listener of Keycloak, a solution for integrated identity and access management. The issue occurs when the listener is configured to include the idp tag. An unauthenticated attacker can send requests to the identity broker login endpoint using arbitrary provider aliases, causing the system to create an unlimited number of metric time series. This can lead to excessive memory consumption and degrade the performance of both the server and its monitoring tools.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund28 Sep 2026WID-SEC-2026-3614

  Keycloak (Micrometer): Vulnerability allows denial of service Translated from German

  CVE-2026-101333

[ References ]References

• access.redhat.com/security/cve/CVE-2026-101333
• bugzilla.redhat.com/show_bug.cgi