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.

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.

EPSS: 0.004 (34.4th percentile) — read the EPSS interpretation.

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.

Affected products

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking, Issue Tracking, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, vendor-advisory, Vendor Advisory)
secalert@redhat.com (x_refsource_REDHAT, 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.