---
id: CVE-2026-101333
title: >-
  A flaw was found in the Micrometer user-event metrics listener of Keycloak, a
  solution for integrated identity and access management
summary: >-
  A flaw was found in the Micrometer user-event metrics listener of Keycloak, a
  solution for integrated identity and access management. The issue occurs when
  the listener is configured to include the idp tag. An unauthenticated attacker
  ca…
severity: low
cvss: 3.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-770
vendor: Red Hat
product: keycloak-services
affected:
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
published: '2026-09-28'
updated: '2026-09-28'
sourceUpdated: '2026-09-28T15:17:13.260'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-101333'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-101333'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2542498'
    label: secalert@redhat.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-28T15:18:11.650639Z'
ingestedAt: '2026-09-28T15:13:31.602Z'
---

## Overview

A flaw was found in the Micrometer user-event metrics listener of Keycloak, a solution for integrated identity and access management. The issue occurs when the listener is configured to include the idp tag. An unauthenticated attacker can send requests to the identity broker login endpoint using arbitrary provider aliases, causing the system to create an unlimited number of metric time series. This can lead to excessive memory consumption and degrade the performance of both the server and its monitoring tools.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.