Resource exhaustion in Red Hat Build Of Keycloak
CVE-2026-16100
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-16100 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50848 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50849 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-16100?
- CVE-2026-16100 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 6.5/10. Published 2026-08-05.
- How severe is CVE-2026-16100?
- Medium severity. CVSS v3 base score is 6.5 out of 10.