Org.keycloak/keycloak-quarkus-server: keycloak proxy header handling denial-of-service (dos) vulnerability

4.7 CVSS

Vulnerability Description

A vulnerability was found in the Keycloak Server. The Keycloak Server is vulnerable to a denial of service (DoS) attack due to improper handling of proxy headers. When Keycloak is configured to accept incoming proxy headers, it may accept non-IP values, such as obfuscated identifiers, without proper validation. This issue can lead to costly DNS resolution operations, which an attacker could exploit to tie up IO threads and potentially cause a denial of service. The attacker must have access to send requests to a Keycloak instance that is configured to accept proxy headers, specifically when reverse proxies do not overwrite incoming headers, and Keycloak is configured to trust these headers.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2024-9666

Check My Exposure

Credits & Attribution

No credits recorded in the NVD database.

References

More from Unknown

View All →

CVE-2025-9978

Jeg Elementor Kit < 2.7.0 - Author+ Stored XSS

Unknown 0

CVE-2025-9959

Sandbox escape in smolagents Local Python execution environment via dunder attributes

High 7.6

CVE-2025-9900

Libtiff: libtiff write-what-where

High 8.8

CVE-2025-9784

Undertow: undertow madeyoureset http/2 ddos vulnerability

High 7.5

CVE-2025-9710

Responsive Lightbox & Gallery < 2.5.3 - Unauthenticated Stored-XSS via Comments

Unknown 0

Affected Vendor

Unknown

View all reports →

Affected Software

Red Hat build of Keycloak 24, Red Hat build of Keycloak 24.0.9, Red Hat build of Keycloak 26.0, Red Hat build of Keycloak 26.0.6, Red Hat JBoss Enterprise Application Platform 8

Vulnerable Versions:

0, 25.0.0, 24.0.9-1, 24-18, 26.0.6-2, 26.0-5, 26.0-6