CVE-2026-2575: Red Hat Build Of Keycloak

Medium severity, CVSS 5.3. EPSS: 0.8% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.

Affected products

• Red Hat Build Of Keycloak: from 26.4, before 26.4.10 (fixed in 26.4.10)

Published 2026-03-18. Last modified 2026-10-06.