---
id: CVE-2026-107602
title: >-
  Keycloak-services: keycloak-services: unauthenticated cpu exhaustion via saml
  1.1 keyinfo infinite loop
summary: >-
  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, ca…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-835
vendor: Red Hat
product: keycloak-services
affected:
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T16:04:51.527Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-107602'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107602'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2547937'
    label: RHBZ#2547937
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.326Z'
---

## Overview

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.

## Affected

- `keycloak-services (all versions)`
- `rhbk/keycloak-rhel9 (all versions)`
- `keycloak-services`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.