{"id":"BIT-keycloak-2026-16100","summary":"Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics via request-controlled error text","details":"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.","aliases":["CVE-2026-16100"],"modified":"2026-09-08T08:48:06.656298830Z","published":"2026-08-25T11:41:46.325Z","database_specific":{"cpes":["cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*","cpe:2.3:a:keycloak:keycloak:*:*:*:*:*:*:*:*"],"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:50848"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:50849"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-16100"},{"type":"ADVISORY","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2501730"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-16100"}],"affected":[{"package":{"name":"keycloak","ecosystem":"Bitnami","purl":"pkg:bitnami/keycloak"},"ranges":[{"type":"SEMVER","events":[{"introduced":"26.6.0"},{"fixed":"26.6.5"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/keycloak/BIT-keycloak-2026-16100.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}