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CVE-2025-11419

Good to know:

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Date: 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.

Severity Score

Related Resources (10)

https://access.redhat.com/errata/RHSA-2025:18889
https://github.com/keycloak/keycloak/security/advisories/GHSA-q8hq-4h99-fj7x
https://access.redhat.com/security/cve/CVE-2025-11419
https://access.redhat.com/errata/RHSA-2025:18254
https://access.redhat.com/errata/RHSA-2025:18890
https://bugzilla.redhat.com/show_bug.cgi?id=2402142
https://nvd.nist.gov/vuln/detail/CVE-2025-11419
https://github.com/keycloak/keycloak
https://access.redhat.com/errata/RHSA-2025:18255
https://www.mend.io/vulnerability-database/CVE-2025-11419

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade Version

Upgrade to version org.keycloak:keycloak-quarkus-dist:26.0.16;org.keycloak:keycloak-quarkus-dist:26.2.10;org.keycloak:keycloak-quarkus-dist:26.4.1;https://github.com/keycloak/keycloak.git - 26.0.16;https://github.com/keycloak/keycloak.git - 26.2.10;https://github.com/keycloak/keycloak.git - 26.4.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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