RHSA-2025:18255

Vulnerability from csaf_redhat - Published: 2025-10-16 14:50 - Updated: 2025-12-23 20:43
Summary
Red Hat Security Advisory: Red Hat build of Keycloak 26.0.16 Update

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.
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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"
        }
      ],
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          "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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        {
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          "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"
        }
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      "release_date": "2025-10-07T00:00:00+00:00",
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          "restart_required": {
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          "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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Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.