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Vulnerability · Published Dec 23, 2025 · Assigned by redhat

CVE-2025-11419Keycloak: keycloak tls client-initiated renegotiation denial of service

High 7.5

In plain English

A high-severity resource allocation without limits in keycloak. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 46.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Mavenorg.keycloak:keycloak-quarkus-dist26.0.16GHSA-q8hq-4h99-fj7x
Mavenorg.keycloak:keycloak-quarkus-dist26.2.10GHSA-q8hq-4h99-fj7x
Mavenorg.keycloak:keycloak-quarkus-dist26.4.1GHSA-q8hq-4h99-fj7x

Affected products (as reported)

VendorProductVersions
keycloak 0 – before 26.0.1626.2.0 – before 26.2.1026.4.0 – before 26.4.1
Red Hat Red Hat build of Keycloak 26.0 see references
Red Hat Red Hat build of Keycloak 26.0 see references
Red Hat Red Hat build of Keycloak 26.0 see references
Red Hat Red Hat build of Keycloak 26.0.16 see references
Red Hat Red Hat build of Keycloak 26.2 see references
Red Hat Red Hat build of Keycloak 26.2 see references
Red Hat Red Hat build of Keycloak 26.2 see references
Red Hat Red Hat build of Keycloak 26.2.10 see references

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References