CVE-2026-2575

MEDIUM5.3

Keycloak: keycloak: denial of service due to excessive samlrequest decompression

Published Mar 18, 2026

Modified 1 months ago

Details

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.

References

ADVISORY

https://access.redhat.com/errata/RHSA-2026:3947

ADVISORY

https://access.redhat.com/errata/RHSA-2026:3948

WEB

https://access.redhat.com/security/cve/CVE-2026-2575

WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2440149

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-2575

CVSS Analysis