CVE-2025-11419 Keycloak: keycloak tls client-initiated renegotiation denial of service
Unauthenticated attackers can cause denial of service in Keycloak by exhausting CPU resources via repeated TLS client-initiated renegotiation requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-11419?
CVE-2025-11419 is a high-severity denial of service vulnerability in Red Hat build of Keycloak 26.0, published on 23 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Keycloak. This vulnerability allows an unauthenticated remote attacker to cause a denial of service (DoS) by repeatedly initiating TLS 1.2 client-initiated renegotiation requests to exhaust server CPU resources, making the service unavailable.
Weakness: CWE-770
Which versions are affected by CVE-2025-11419?
6 open source packages ship an affected version, including org.keycloak:keycloak-quarkus-dist.
| Package | Affected | Fixed in |
|---|---|---|
org.keycloak:keycloak-quarkus-dist Maven | All versions | 26.0.16 |
org.keycloak:keycloak-quarkus-dist Maven | All versions | 26.0.16 |
org.keycloak:keycloak-quarkus-dist Maven | From 26.1.0 | 26.2.10 |
org.keycloak:keycloak-quarkus-dist Maven | From 26.1.0 | 26.2.10 |
org.keycloak:keycloak-quarkus-dist Maven | From 26.3.0 | 26.4.1 |
org.keycloak:keycloak-quarkus-dist Maven | From 26.3.0 | 26.4.1 |
How do I fix CVE-2025-11419?
Upgrade org.keycloak:keycloak-quarkus-dist to a fixed version for your release line: 26.0.16, 26.2.10 or 26.4.1.
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-2025-11419 being exploited?
There is no known exploitation of CVE-2025-11419 in the wild and no public exploit code.
Sources
Also known as GHSA-q8hq-4h99-fj7x.