{"id":"CVE-2026-107602","title":"Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo infinite loop","summary":"A flaw was found in the SAML 1.1 XML parsing logic of Keycloak, an open-source identity and access management solution. The issue occurs when the parser encounters unexpected elements within a security token's key information section, ca…","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","cvssSource":"cna","cwe":["CWE-835"],"vendor":"Red Hat","product":"keycloak-services","affected":["keycloak-services (all versions)","rhbk/keycloak-rhel9 (all versions)","keycloak-services"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T16:04:51.527Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107602","references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-107602"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2547937","label":"RHBZ#2547937"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.326Z","slug":"CVE-2026-107602","body":"## Overview\n\nA flaw was found in the SAML 1.1 XML parsing logic of Keycloak, an open-source identity and access management solution. The issue occurs when the parser encounters unexpected elements within a security token's key information section, causing the processing thread to enter an infinite loop. An unauthenticated remote attacker could exploit this by sending specially crafted requests, leading to 100% CPU usage and a total denial of service that requires a server restart to resolve.\n\n## Affected\n\n- `keycloak-services (all versions)`\n- `rhbk/keycloak-rhel9 (all versions)`\n- `keycloak-services`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n### Workarounds\n\nMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}