{"id":"CVE-2026-79651","title":"A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak","summary":"A flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak. The issue occurs because the system accepts arbitra…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-400"],"vendor":"Red Hat","product":"keycloak-rhel9-container","affected":["keycloak-rhel9-container (all versions)","keycloak-rhel9-operator-container (all versions)","rhbk/keycloak-operator-bundle (all versions)","keycloak/rhbk-openshift-rhel9","keycloak-services","rhbk/keycloak-rhel9","keycloak-rhel9-container (all versions)","keycloak-rhel9-operator-bundle-container (all versions)","keycloak-rhel9-operator-container (all versions)","keycloak/rhbk-openshift-rhel9","keycloak-services","rhbk/keycloak-rhel9","keycloak-services"],"patched":["build_of_keycloak 26.4","build_of_keycloak 26.4.16","build_of_keycloak 26.6.7"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T19:42:43.623","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-79651","references":[{"url":"https://access.redhat.com/errata/RHSA-2026:68276","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68277","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68278","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:68280","label":"secalert@redhat.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-79651","label":"secalert@redhat.com"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523345","label":"secalert@redhat.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-79651.json"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-79651"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-79651"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-16T15:35:46.159784Z"},"ingestedAt":"2026-09-16T14:57:28.027Z","epss":0.00622,"epssPercentile":0.48164,"slug":"CVE-2026-79651","body":"## Overview\n\nA flaw was found in the theme localization endpoints of the keycloak-services component, which is the core service responsible for authentication flows and theme management in Keycloak. The issue occurs because the system accepts arbitrary locale tags from unauthenticated requests and stores them in a permanent in-memory cache without limits. An attacker can exploit this by sending a large number of unique locale tags, eventually causing the server to run out of memory and crash.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:68276** · Red Hat · fixed in: Red Hat build of Keycloak 26.4 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68276)\n- **RHSA-2026:68280** · Red Hat · fixed in: Red Hat build of Keycloak 26.4.16 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68280)\n- **RHSA-2026:68278** · Red Hat · fixed in: Red Hat build of Keycloak 26.6.7 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68278)\n- **RHSA-2026:68277** · Red Hat · fixed in: Red Hat build of Keycloak 26.6 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68277)","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}