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        {
          "names": [
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          "organization": "Independent Security Researcher"
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      "cve": "CVE-2026-4634",
      "cwe": {
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        "name": "Excessive Platform Resource Consumption within a Loop"
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      "discovery_date": "2026-03-23T08:40:02.817000+00:00",
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          "text": "2450250"
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        {
          "category": "description",
          "text": "A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "keycloak: Keycloak: Denial of Service via excessive processing of OpenID Connect scope parameters",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important denial of service vulnerability in Red Hat Build of Keycloak (RHBK). An unauthenticated attacker can exploit this flaw by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect token endpoint, leading to high resource consumption and prolonged processing times on the Keycloak server.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's 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",
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            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4065d584a57daa2aa2259afa19844f6308e2f6a252b08738c809002cc84aa606_s390x",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:4c4f3e098f715efc174a4a01803b7133ca7c2b744ea4b8151c7edcae608d9531_ppc64le",
            "9Base-RHBK-26.2:rhbk/keycloak-rhel9@sha256:b3fe3f4c74e96a2daf735fe5e8df98b2fa6f023cfda0c7cd4915a83556e14efb_amd64"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6476"
        },
        {
          "category": "vendor_fix",
          "date": "2026-04-02T13:58:01+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-26.4:rhbk/keycloak-operator-bundle@sha256:7fb041b0e2b43954c3a83b58fd885b1cdc5bb32275e06c4c72955da5b78255c3_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:0d90a1c28652b5f73ea90f78968548178cf710121fcb13774a467aeb9c30ab09_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:1a7ac3c798d83cc37dd750ed44223630f4ebff937534a59a9e9ad029dbf31a0f_amd64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:715a5c6cc9061fc0305370a33f5b69a96ba7bfdb23b706a567b489fc05b05e06_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9-operator@sha256:c68d195c2d19568d9789648ef347a3388da453c83120d696453333c34a564347_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:33fc8c6edb3c5c2df302ea53a89454320e08ff4660ba84d0a78f6c67178dfb16_s390x",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:a4cb583985eb220ad05b1983a98a5a50e2b76c15e6f56152045591e3994f37d1_ppc64le",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6478"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-06T11:45:00+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el9sso.noarch",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el9sso.src",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-server-0:18.0.20-1.redhat_00001.1.el9sso.noarch"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:76130"
        },
        {
          "category": "vendor_fix",
          "date": "2026-10-05T18:18:32+00:00",
          "details": "Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.\n\nThe References section of this erratum contains a download link (you must log in to download the update).",
          "product_ids": [
            "Red Hat Single Sign-On 7.6.13"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:76132"
        },
        {
          "category": "vendor_fix",
          "date": "2026-04-02T13:53:32+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": [
            "Red Hat build of Keycloak 26.2.15"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6475"
        },
        {
          "category": "vendor_fix",
          "date": "2026-04-02T13:54:47+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": [
            "Red Hat build of Keycloak 26.4.11"
          ],
          "url": "https://access.redhat.com/errata/RHSA-2026:6477"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
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      ],
      "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": [
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        {
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          "details": "Important",
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            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:c1c1cb36f70ca142a789b359f9a120d321f58adc44e2c97a49c2d6f270d15bd9_arm64",
            "9Base-RHBK-26.4:rhbk/keycloak-rhel9@sha256:dc54248ad9357fbd737e6983e6d8d0c7e845e39ed6558bd7c39f7a7573459489_amd64",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el9sso.noarch",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.20-1.redhat_00001.1.el9sso.src",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-server-0:18.0.20-1.redhat_00001.1.el9sso.noarch",
            "Red Hat Single Sign-On 7.6.13",
            "Red Hat build of Keycloak 26.2.15",
            "Red Hat build of Keycloak 26.4.11"
          ]
        }
      ],
      "title": "keycloak: Keycloak: Denial of Service via excessive processing of OpenID Connect scope parameters"
    }
  ]
}