A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication, the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time, for example, 24 or 48 hours, the cache can grow indefinitely, leading to an OutOfMemoryError. This issue could result in a denial of service condition, preventing legitimate users from accessing the system.

Affected: Maven: org.keycloak:keycloak-services

A flaw was found in Keycloak. When the configuration uses JWT tokens for authentication, the tokens are cached until expiration. If a client uses JWT tokens with an excessively long expiration time, for example, 24 or 48 hours, the cache can grow indefinitely, leading to an OutOfMemoryError. This issue could result in a denial of service condition, preventing legitimate users from accessing the system.

org.keycloak/keycloak-services: JWT Token Cache Exhaustion Leading to Denial of Service (DoS) in Keycloak org.keycloak.protocol.services: Keycloak hostname verification org.keycloak.authentication: Two factor authentication bypass

Ein entfernter, authentisierter Angreifer kann eine Schwachstelle in Keycloak ausnutzen, um einen Denial of Service Angriff durchzuführen.