Keycloak SAML 1.1 Assertion Parser Infinite Loop DoS (CVE2026110931)
CVE-2026-110931 Published on November 5, 2026
Keycloak-services: keycloak-services: unauthenticated jvm termination via saml 1.1 authoritybinding parsing loop
A flaw was found in the SAML 1.1 assertion parser of Keycloak, a tool used for identity and access management. The issue occurs when the parser handles a specific element called AuthorityBinding within an authentication statement. Due to an incomplete fix for a previous vulnerability, the parser can enter an infinite loop that consumes all available memory, causing the entire Keycloak service to crash and become unavailable to users.
Vulnerability Analysis
CVE-2026-110931 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Timeline
Reported to Red Hat.
Made public. 22 days later.
Weakness Type
What is an Infinite Loop Vulnerability?
The program contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop. If the loop can be influenced by an attacker, this weakness could allow attackers to consume excessive resources such as CPU or memory.
CVE-2026-110931 has been classified to as an Infinite Loop vulnerability or weakness.
Products Associated with CVE-2026-110931
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