RHSA-2025:18255

Vulnerability from csaf_redhat - Published: 2025-10-16 14:50 - Updated: 2026-04-20 17:46
Summary
Red Hat Security Advisory: Red Hat build of Keycloak 26.0.16 Update
Severity
Important
Notes
Topic: New Red Hat build of Keycloak 26.0.16 packages are available from the Customer Portal
Details: Red Hat build of Keycloak 26.0.16 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. Security fixes: * Keycloak TLS Client-Initiated Renegotiation Denial of Service (CVE-2025-11419)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

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.

CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le
Vendor Fix fix
Workaround
Threats
Impact Important

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  "vulnerabilities": [
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      "cve": "CVE-2025-11419",
      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2025-10-07T11:12:36.431000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2402142"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "keycloak: Keycloak TLS Client-Initiated Renegotiation Denial of Service",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
          "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
          "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
          "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-11419"
        },
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          "summary": "RHBZ#2402142",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402142"
        },
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-11419",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-11419"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-11419",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-11419"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/discussions/25209",
          "url": "https://github.com/keycloak/keycloak/discussions/25209"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/issues/43020",
          "url": "https://github.com/keycloak/keycloak/issues/43020"
        }
      ],
      "release_date": "2025-10-07T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2025-10-16T14:50:34+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.",
          "product_ids": [
            "9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2025:18255"
        },
        {
          "category": "workaround",
          "details": "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.",
          "product_ids": [
            "9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "9Base-RHBK-26.0:rhbk/keycloak-operator-bundle@sha256:43a298583415c35ecbb5325283a9892566bd08fb0eb2ebd37e90610d88269649_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:14b0fbc122f85168376a1769d591641fc2c8e93c0d0b771065cd3779b5ebc546_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:3df0789cf7012777396528a72fd7c8af718bdf61e79ca3a5097ee77e37ade59d_ppc64le",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9-operator@sha256:aef5994b152d534e81c9832b67cf6ff68e760d55915f830be02ac2bcaceae553_s390x",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:42c1e459585e03df56aca5bbf83081d95f21b121f623fec4d36e9a42f697f945_s390x",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:bbda28678bec5d9778a3f0da5bb2cb9becc971f6080eb03758316721720b83e8_amd64",
            "9Base-RHBK-26.0:rhbk/keycloak-rhel9@sha256:cfc457ab3d6cadd50622b18a1bf3967754545ba3cc435cd29ad4e80d592050e5_ppc64le"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "keycloak: Keycloak TLS Client-Initiated Renegotiation Denial of Service"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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