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GHSA-f6r7-6w34-x2gp

Keycloak Vulnerable to Improper Validation of Specified Quantity in Input

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-9801

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-ldap-federation < 26.6.3 26.6.3

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.