Vulnerability Details CVE-2026-9801
A flaw was found in Keycloak. A remote attacker with high privileges, such as a realm administrator configuring a malicious Lightweight Directory Access Protocol (LDAP) server or an attacker compromising an upstream LDAP server, could exploit this vulnerability. By sending a malformed LDAP password policy response during a password authentication request, the attacker can trigger an OutOfMemoryError. This causes the Keycloak Java Virtual Machine (JVM) to terminate, leading to a denial of service (DoS) for all realms on the affected node.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 53.9%
CVSS Severity
CVSS v3 Score 4.9
References
Products affected by CVE-2026-9801
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cpe:2.3:a:redhat:build_of_keycloak:-