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    2 vulnerabilities found for Red Hat build of Keycloak 26.0.16 by Red Hat

    CVE-2025-11419 (GCVE-0-2025-11419)

    Vulnerability from nvd – Published: 2025-12-23 20:42 – Updated: 2026-04-20 17:45
    VLAI
    Title
    Keycloak: keycloak tls client-initiated renegotiation denial of service
    Summary
    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.
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    Impacted products
    Vendor Product Version
    Affected: 0 , < 26.0.16 (semver)
    Unknown: 26.1.0 , < 26.1.* (semver)
    Affected: 26.2.0 , < 26.2.10 (semver)
    Unknown: 26.3.0 , < 26.3.* (semver)
    Affected: 26.4.0 , < 26.4.1 (semver)
    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0.16-2 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.0::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0-20 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.0::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0-21 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.0::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.0.16     cpe:/a:redhat:build_keycloak:26.0
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2.10-2 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.2::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2-11 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.2::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2.10     cpe:/a:redhat:build_keycloak:26.2::el9
    Create a notification for this product.
    Date Public
    2025-10-07 00:00
    Show details on NVD website

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    CVE-2025-11419 (GCVE-0-2025-11419)

    Vulnerability from cvelistv5 – Published: 2025-12-23 20:42 – Updated: 2026-04-20 17:45
    VLAI
    Title
    Keycloak: keycloak tls client-initiated renegotiation denial of service
    Summary
    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.
    SSVC
    Exploitation: none Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    Impacted products
    Vendor Product Version
    Affected: 0 , < 26.0.16 (semver)
    Unknown: 26.1.0 , < 26.1.* (semver)
    Affected: 26.2.0 , < 26.2.10 (semver)
    Unknown: 26.3.0 , < 26.3.* (semver)
    Affected: 26.4.0 , < 26.4.1 (semver)
    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0.16-2 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.0::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0-20 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.0::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.0 Unaffected: 26.0-21 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.0::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.0.16     cpe:/a:redhat:build_keycloak:26.0
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2.10-2 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.2::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2-11 , < * (rpm)
        cpe:/a:redhat:build_keycloak:26.2::el9
    Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2.10     cpe:/a:redhat:build_keycloak:26.2::el9
    Create a notification for this product.
    Date Public
    2025-10-07 00:00
    Show details on NVD website

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                "vendor-advisory",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/errata/RHSA-2025:18889"
            },
            {
              "name": "RHSA-2025:18890",
              "tags": [
                "vendor-advisory",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/errata/RHSA-2025:18890"
            },
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2025-11419"
            },
            {
              "name": "RHBZ#2402142",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402142"
            },
            {
              "url": "https://github.com/keycloak/keycloak/discussions/25209"
            },
            {
              "url": "https://github.com/keycloak/keycloak/issues/43020"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2025-10-07T11:12:36.431Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2025-10-07T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Keycloak: keycloak tls client-initiated renegotiation denial of service",
          "workarounds": [
            {
              "lang": "en",
              "value": "To mitigate this vulnerability, configure Keycloak to reject client-initiated TLS renegotiation by adding the following Java system property to the Keycloak startup configuration:\n-Djdk.tls.rejectClientInitiatedRenegotiation=true\n\nThis prevents unauthenticated attackers from triggering repeated TLS renegotiations and exhausting server CPU resources.\nAdditionally, ensure that Keycloak is deployed behind proper network access controls and rate-limiting mechanisms to further reduce exposure to DoS attacks."
            }
          ],
          "x_generator": {
            "engine": "cvelib 1.8.0"
          },
          "x_redhatCweChain": "CWE-770: Allocation of Resources Without Limits or Throttling"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2025-11419",
        "datePublished": "2025-12-23T20:42:38.699Z",
        "dateReserved": "2025-10-07T11:19:18.134Z",
        "dateUpdated": "2026-04-20T17:45:58.307Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }