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CVE-2026-16100 Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics via request-controlled error text

🗓️ 05 Aug 2026 13:50:57Reported by redhatType 
cvelist
 cvelist
🔗 www.cve.org👁 4 Views

Keycloak records raw error messages as metric labels for user events, causing unbounded cardinality.

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Affected
Refs
ReporterTitlePublishedViews
Family
cve
CVE
CVE-2026-16100
5 Aug 202613:50
cve
redhatcve
RedhatCVE
CVE-2026-16100
5 Aug 202613:50
redhatcve
[
  {
    "vendor": "Red Hat",
    "product": "Red Hat Build of Keycloak",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "keycloak-services",
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:build_keycloak:"
    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Build of Keycloak",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "rhbk-keycloak-rhel9/rhbk-keycloak-rhel9",
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:build_keycloak:"
    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Build of Keycloak",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "rhbk-openshift-rhel9/rhbk-openshift-rhel9",
    "defaultStatus": "affected",
    "cpes": [
      "cpe:/a:redhat:build_keycloak:"
    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Data Grid 8",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "keycloak-services",
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:jboss_data_grid:8"
    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat JBoss Enterprise Application Platform Expansion Pack",
    "collectionURL": "https://access.redhat.com/jbossnetwork/restricted/listSoftware.html",
    "packageName": "keycloak-services",
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:jbosseapxp"
    ]
  },
  {
    "vendor": "Red Hat",
    "product": "Red Hat Single Sign-On 7",
    "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
    "packageName": "keycloak-services",
    "defaultStatus": "unaffected",
    "cpes": [
      "cpe:/a:redhat:red_hat_single_sign_on:7"
    ]
  }
]

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