Improper handling of highly compressed data in Keycloak - CVE-2026-2575

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Main Vulnerability Database Vulnerabilities #VU148922

Improper handling of highly compressed data in Keycloak - CVE-2026-2575

Published: September 10, 2026


Vulnerability identifier: #VU148922
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-2575
CWE-ID: CWE-409
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of highly compressed data in SAMLRequest decompression when processing a crafted SAMLRequest. A remote attacker can send a specially crafted SAMLRequest to cause a denial of service.


Affected software

Keycloak
Red Hat build of Keycloak

How to mitigate CVE-2026-2575

Install security update from vendor's website.

Keycloak - update to 26.5.4
Red Hat build of Keycloak - update to 26.4.10

External References

Related Security Bulletins