CVE-2025-11419
December 23, 2025
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.
Affected Packages
https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.1.0 <26.2.10Fix Suggestion:
Update to version 26.2.10https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=26.3.0 <26.4.1Fix Suggestion:
Update to version 26.4.1https://github.com/keycloak/keycloak.git (GITHUB):
Affected version(s) >=1.0-alpha-1 <26.0.16Fix Suggestion:
Update to version 26.0.16org.keycloak:keycloak-quarkus-dist (JAVA_ARCHIVE_BY_JAVA):
Affected version(s) >=26.1.0 <26.2.10Fix Suggestion:
Update to version 26.2.10org.keycloak:keycloak-quarkus-dist (JAVA_ARCHIVE_BY_JAVA):
Affected version(s) >=17.0.0 <26.0.16Fix Suggestion:
Update to version 26.0.16Related Resources (9)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.05
