---
id: CVE-2026-107123
title: >-
  Keycloak-services: keycloak-services: unauthenticated cpu denial of service
  via saml xml datetime and duration parsing
summary: >-
  A flaw was found in the SAML XML processing component of Keycloak, an
  open-source identity and access management solution. The issue occurs when the
  server parses XML documents containing excessively long dateTime or duration
  values. Bec…
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-400
vendor: Red Hat
product: keycloak-services
affected:
  - keycloak-services (all versions)
  - rhbk/keycloak-rhel9 (all versions)
  - keycloak-services
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-05T20:53:39.682604Z'
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T20:53:47.046Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-107123'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107123'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2547297'
    label: RHBZ#2547297
tags:
  - cve.org
ingestedAt: '2026-11-05T22:38:31.935Z'
---

## Overview

A flaw was found in the SAML XML processing component of Keycloak, an open-source identity and access management solution. The issue occurs when the server parses XML documents containing excessively long dateTime or duration values. Because these strings are not properly validated before processing, the XML parser consumes excessive CPU time. An unauthenticated remote attacker can exploit this by sending specially crafted SAML requests to the server, leading to high CPU utilization and a denial of service for all 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.