A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error messages from failed account operations as Prometheus metric labels. Because these error messages can include user-supplied input like nonexistent client IDs, an authenticated user can create a massive number of unique metric entries, eventually exhausting system memory and causing the service to crash or become unavailable.
Metrics
Affected Vendors & Products
References
History
Wed, 05 Aug 2026 14:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error messages from failed account operations as Prometheus metric labels. Because these error messages can include user-supplied input like nonexistent client IDs, an authenticated user can create a massive number of unique metric entries, eventually exhausting system memory and causing the service to crash or become unavailable. | |
| Title | Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics via request-controlled error text | |
| First Time appeared |
Redhat
Redhat build Keycloak Redhat jboss Data Grid Redhat jbosseapxp Redhat red Hat Single Sign On |
|
| CPEs | cpe:/a:redhat:build_keycloak: cpe:/a:redhat:jboss_data_grid:8 cpe:/a:redhat:jbosseapxp cpe:/a:redhat:red_hat_single_sign_on:7 |
|
| Vendors & Products |
Redhat
Redhat build Keycloak Redhat jboss Data Grid Redhat jbosseapxp Redhat red Hat Single Sign On |
|
| References |
| |
| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-08-05T13:50:57.057Z
Reserved: 2026-07-17T14:26:03.169Z
Link: CVE-2026-16100
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OpenCVE Enrichment
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