A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.

Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-xv6h-r36f-3gp5 Keycloak: Denial of Service due to excessive SAMLRequest decompression
Fixes

Solution

No solution given by the vendor.


Workaround

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.

History

Wed, 18 Mar 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 18 Mar 2026 04:15:00 +0000

Type Values Removed Values Added
Description No description is available for this CVE. A flaw was found in Keycloak. An unauthenticated remote attacker can trigger an application level Denial of Service (DoS) by sending a highly compressed SAMLRequest through the SAML Redirect Binding. The server fails to enforce size limits during DEFLATE decompression, leading to an OutOfMemoryError (OOM) and subsequent process termination. This vulnerability allows an attacker to disrupt the availability of the service.
Title keycloak: Keycloak: Denial of Service due to excessive SAMLRequest decompression Keycloak: keycloak: denial of service due to excessive samlrequest decompression
First Time appeared Redhat
Redhat build Keycloak
CPEs cpe:/a:redhat:build_keycloak:26.4::el9
Vendors & Products Redhat
Redhat build Keycloak
References

Tue, 17 Feb 2026 09:00:00 +0000

Type Values Removed Values Added
First Time appeared Keycloak
Keycloak keycloak
Vendors & Products Keycloak
Keycloak keycloak

Mon, 16 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
Description No description is available for this CVE.
Title keycloak: Keycloak: Denial of Service due to excessive SAMLRequest decompression
Weaknesses CWE-409
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

threat_severity

Moderate


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-03-18T13:34:42.871Z

Reserved: 2026-02-16T08:39:17.943Z

Link: CVE-2026-2575

cve-icon Vulnrichment

Updated: 2026-03-18T13:34:39.242Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-03-18T04:17:16.783

Modified: 2026-03-18T14:52:44.227

Link: CVE-2026-2575

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-02-16T08:08:00Z

Links: CVE-2026-2575 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-02-17T08:50:15Z

Weaknesses