CVE-2025-11419
Keycloak: keycloak tls client-initiated renegotiation denial of service
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Published | Dec 23, 2025 |
| Last Updated | Dec 23, 2025 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat build of Keycloak 26.0
All versions affected Red Hat / Red Hat build of Keycloak 26.0
All versions affected Red Hat / Red Hat build of Keycloak 26.0
All versions affected Red Hat / Red Hat build of Keycloak 26.0.16
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2
All versions affected Red Hat / Red Hat build of Keycloak 26.2.10
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2025:18254 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:18255 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:18889 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:18890 access.redhat.com: https://access.redhat.com/security/cve/CVE-2025-11419 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2402142