Skip to content
Sign in
7.5 High

CVE-2026-107602 Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml 1.1 keyinfo infinite loop

Description

A flaw was found in the SAML 1.1 XML parsing logic of Keycloak, an open-source identity and access management solution. The issue occurs when the parser encounters unexpected elements within a security token's key information section, causing the processing thread to enter an infinite loop. An unauthenticated remote attacker could exploit this by sending specially crafted requests, leading to 100% CPU usage and a total denial of service that requires a server restart to resolve.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
Low
Privileges required
None
Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Build of Keycloak Versions not published
Red Hat Single Sign-On 7 Versions not published
Red Hat build of Keycloak 26.4 26.4 earliest → < 26.4-30 26.4-30
Red Hat build of Keycloak 26.6.8 Versions not published
Red Hat build of Keycloak 26.4.17 Versions not published
Red Hat build of Keycloak 26.6 26.6 earliest → < 26.6-24 26.6-24

Other CVEs of Red Hat Build of Keycloak

The 277 CVEs of Red Hat Build of Keycloak →
CVE-2026-120984 Keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline javascript policy import 9.1 Critical CVE-2026-9797 Keycloak: keycloak: privilege escalation via client authentication manipulation by an authenticated administrator 6.5 Medium CVE-2026-97848 Keycloak-services: keycloak-services: protocol mapper with jsontype=json bypasses token sanitization 6.5 Medium CVE-2026-97367 Keycloak-services: keycloak-services: dcr azp and sid claim substitution allows account rest session takeover 6.4 Medium
Track this CVE