# CVE-2026-110931: Keycloak SAML 1.1 assertion parser infinite loop denial of service

Source: https://junglewise.ai/threats/cve-2026-110931-a-flaw-was-found-in-the-saml-1-1-assertion-parser-of-keycloak-a  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-05. Updated: 2026-11-05  
License: CC BY 4.0 with a link back

CVE-2026-110931 · Severity: high · CVSS 7.5 · Published 2026-11-05

Keycloak is an identity and access management system that handles user authentication and authorization for enterprise applications. A flaw in its SAML 1.1 parser can be exploited by an unauthenticated attacker to crash the entire service by sending a specially crafted authentication request, making the system unavailable to all legitimate users until it is restarted.

Technologies: [Red Hat Keycloak](https://junglewise.ai/threats/technologies/red-hat-keycloak). Vendors: [Red Hat](https://junglewise.ai/threats/vendors/red-hat).

## Quick answers

**Is CVE-2026-110931 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110931 being exploited in the wild.

**How severe is CVE-2026-110931?** High severity, with a CVSS score of 7.5, published 5 November 2026.

**Which products and versions are affected?** Red Hat Keycloak.

**Is there a fix for CVE-2026-110931?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-110931 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-110931?** Check whether you run Red Hat Keycloak. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an infinite loop in the SAML 1.1 AuthorityBinding parsing logic (CWE-835) that results from an incomplete fix for a prior vulnerability. An unauthenticated, remote attacker can trigger memory exhaustion and JVM termination by sending a single malicious SAML assertion, causing complete service unavailability. No mitigation is available according to Red Hat; upgrading to a patched version is required.

## Affected products

- Red Hat Keycloak

## Timeline

- 2026-11-05: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-110931](https://access.redhat.com/security/cve/CVE-2026-110931)

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