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Vulnerabilities CVE-2026-16100

CVE-2026-16100

Medium
Open
TLP:CLEAR

Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics via request-controlled error text

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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.

Details

CVSS Score
6.5
EPSS Score
0.31%

23.2th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Confidence
90%
Published
Aug 5, 2026
Last Modified
Aug 5, 2026
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