CVE-2026-9801 – Keycloak: keycloak: denial of service via malformed ldap password policy response

CVE ID :CVE-2026-9801

Published : May 28, 2026, 6:16 a.m. | 15 minutes ago

Description :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.

Severity: 4.9 | MEDIUM

Visit the link for more details, such as CVSS details, affected products, timeline, and more…