CVE-2026-2575 MEDIUM

CVE-2026-2575: Keycloak: keycloak: denial of service due to excessive samlrequest decompression

Vendor Red Hat
Product Red Hat build of Keycloak 26.4.10
Weakness CWE-409
Published March 18, 2026
Last update March 18, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 18, 2026 CVE published
March 18, 2026 Record updated