CVE-2026-7307: Red Hat Build Of Keycloak

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

A flaw was found in Keycloak. A remote, unauthenticated attacker can send a specially crafted XML input to the Security Assertion Markup Language (SAML) endpoint. This malicious input can cause high CPU usage and worker thread starvation, leading to a Denial of Service (DoS) where the server becomes unavailable.

Affected products

• Red Hat Build Of Keycloak: from 26.4, before 26.4.12 (fixed in 26.4.12)

Published 2026-05-19. Last modified 2026-10-06.