Allocation of Resources Without Limits or Throttling Affecting org.keycloak:keycloak-quarkus-server package, versions [,26.7.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Aug 2026
- disclosed5 Aug 2026
- creditUnknown
Introduced: 5 Aug 2026
CVE-2026-16100 (opens in a new tab)How to fix?
Upgrade org.keycloak:keycloak-quarkus-server to version 26.7.1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through account and client error reporting in the user-event metrics component. An authenticated user can trigger the flaw by sending requests that produce failed account operations with varying client IDs or scope-related error text, causing raw error messages to be recorded as Prometheus metric labels. When metrics are enabled, each distinct error string creates new metric entries until memory is exhausted, which can crash the service or make Keycloak unavailable. This affects deployments that expose account or consent endpoints with user-event metrics enabled, and it can also pressure downstream observability systems that ingest the high-cardinality labels.