Feed/CVE-2026-9801
CVE-2026-9801MEDIUMCVSS 4.9

Keycloak Vulnerable to Improper Validation of Specified Quantity in Input

Published May 28, 2026·Updated Jul 1, 2026

NVD 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.

Affected Packages (1)

org.keycloak:keycloak-ldap-federationMAVEN
Fixed in 26.6.3

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

References

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