CVE-2024-11734 Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers
An administrative user can cause a denial of service in Keycloak by inserting newlines into security headers, disrupting server request handling.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-11734?
CVE-2024-11734 is a medium-severity denial of service vulnerability in Red Hat RHBK 26.0.8, published on 14 Jan 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.
Weakness: CWE-693
Which versions are affected by CVE-2024-11734?
2 open source packages ship an affected version, including org.keycloak:keycloak-quarkus-server.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-quarkus-server Maven | All versions | 26.0.8 |
org.keycloak:keycloak-quarkus-server Maven | All versions | 26.0.8 |
How do I fix CVE-2024-11734?
Upgrade org.keycloak:keycloak-quarkus-server to 26.0.8 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2024-11734 being exploited?
There is no known exploitation of CVE-2024-11734 in the wild and no public exploit code.
Sources
Also known as ECHO-2aab-293d-53af, GHSA-w3g8-r9gw-qrh8.