GHSA-Q8HQ-4H99-FJ7X

Vulnerability from github – Published: 2025-10-27 20:46 – Updated: 2026-04-24 21:02
VLAI
Summary
Keycloak TLS Client-Initiated Renegotiation Denial of Service
Details

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-quarkus-dist"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.0.16"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-quarkus-dist"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.1.0"
            },
            {
              "fixed": "26.2.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.keycloak:keycloak-quarkus-dist"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "26.3.0"
            },
            {
              "fixed": "26.4.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-11419"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400",
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-10-27T20:46:54Z",
    "nvd_published_at": "2025-12-23T21:15:46Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-q8hq-4h99-fj7x",
  "modified": "2026-04-24T21:02:53Z",
  "published": "2025-10-27T20:46:54Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/security/advisories/GHSA-q8hq-4h99-fj7x"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11419"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/issues/43020"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:18254"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:18255"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:18889"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/errata/RHSA-2025:18890"
    },
    {
      "type": "WEB",
      "url": "https://access.redhat.com/security/cve/CVE-2025-11419"
    },
    {
      "type": "WEB",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402142"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/keycloak/keycloak"
    },
    {
      "type": "WEB",
      "url": "https://github.com/keycloak/keycloak/discussions/25209"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Keycloak TLS Client-Initiated Renegotiation Denial of Service"
}



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