GHSA-q8hq-4h99-fj7x
Keycloak TLS Client-Initiated Renegotiation Denial of Service
At a glance
- Published
- Updated
- CVE
- CVE-2025-11419
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Keycloak is vulnerable to a Denial of Service (DoS) attack due to the default JDK setting that permits Client-Initiated Renegotiation in TLS 1.2. An unauthenticated remote attacker can repeatedly initiate TLS renegotiation requests to exhaust server CPU resources, making the service unavailable. Immediate mitigation is available by setting the `-Djdk.tls.rejectClientInitiatedRenegotiation=true` Java system property in the Keycloak startup configuration.
Affected packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-quarkus-dist | introduced 0, fixed 26.0.16 |
| Maven · org.keycloak:keycloak-quarkus-dist | introduced 26.1.0, fixed 26.2.10 |
| Maven · org.keycloak:keycloak-quarkus-dist | introduced 26.3.0, fixed 26.4.1 |
References
- https://github.com/keycloak/keycloak/security/advisories/GHSA-q8hq-4h99-fj7x WEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-11419 ADVISORY
- https://github.com/keycloak/keycloak/issues/43020 WEB
- https://access.redhat.com/errata/RHSA-2025:18254 WEB
- https://access.redhat.com/errata/RHSA-2025:18255 WEB
- https://access.redhat.com/errata/RHSA-2025:18889 WEB
- https://access.redhat.com/errata/RHSA-2025:18890 WEB
- https://access.redhat.com/security/cve/CVE-2025-11419 WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2402142 WEB
- https://github.com/keycloak/keycloak PACKAGE
- https://github.com/keycloak/keycloak/discussions/25209 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |