---
id: CVE-2026-110931
title: >-
  Keycloak-services: keycloak-services: unauthenticated jvm termination via saml
  1.1 authoritybinding parsing loop
summary: >-
  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…
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: '2026-11-05T16:04:53.045Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-110931'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-110931'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2553047'
    label: RHBZ#2553047
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.327Z'
---

## Overview

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.

## 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.