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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." } ], "affected": [ { "versions": [ { "status": "affected", "version": "0", "lessThan": "26.0.16", "versionType": "semver" }, { "status": "unknown", "version": "26.1.0", "lessThan": "26.1.*", "versionType": "semver" }, { "status": "affected", "version": "26.2.0", "lessThan": "26.2.10", "versionType": "semver" }, { "status": "unknown", "version": "26.3.0", "lessThan": "26.3.*", "versionType": "semver" }, { "status": "affected", "version": "26.4.0", "lessThan": "26.4.1", "versionType": "semver" } ], "packageName": "keycloak", "collectionURL": "https://github.com/keycloak/keycloak/", "defaultStatus": "unaffected" }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.0", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "rhbk/keycloak-operator-bundle", "defaultStatus": "affected", "versions": [ { "version": "26.0.16-2", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:build_keycloak:26.0::el9" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.0", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "rhbk/keycloak-rhel9", "defaultStatus": "affected", "versions": [ { "version": "26.0-20", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:build_keycloak:26.0::el9" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.0", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "rhbk/keycloak-rhel9-operator", "defaultStatus": "affected", "versions": [ { "version": "26.0-21", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:build_keycloak:26.0::el9" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.0.16", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "keycloak-server", "cpes": [ "cpe:/a:redhat:build_keycloak:26.0" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.2", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "rhbk/keycloak-operator-bundle", "defaultStatus": "affected", "versions": [ { "version": "26.2.10-2", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:build_keycloak:26.2::el9" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.2", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "rhbk/keycloak-rhel9", "defaultStatus": "affected", "versions": [ { "version": "26.2-11", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:build_keycloak:26.2::el9" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.2", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "rhbk/keycloak-rhel9-operator", "defaultStatus": "affected", "versions": [ { "version": "26.2-11", "lessThan": "*", "versionType": "rpm", "status": "unaffected" } ], "cpes": [ "cpe:/a:redhat:build_keycloak:26.2::el9" ] }, { "vendor": "Red Hat", "product": "Red Hat build of Keycloak 26.2.10", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "defaultStatus": "unaffected", "packageName": "keycloak-server", "cpes": [ "cpe:/a:redhat:build_keycloak:26.2::el9" ] } ], "references": [ { "url": "https://access.redhat.com/errata/RHSA-2025:18254", "name": "RHSA-2025:18254", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2025:18255", "name": "RHSA-2025:18255", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2025:18889", "name": "RHSA-2025:18889", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/errata/RHSA-2025:18890", "name": "RHSA-2025:18890", "tags": [ "vendor-advisory", "x_refsource_REDHAT" ] }, { "url": "https://access.redhat.com/security/cve/CVE-2025-11419", "tags": [ "vdb-entry", "x_refsource_REDHAT" ] }, { "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402142", "name": "RHBZ#2402142", "tags": [ "issue-tracking", "x_refsource_REDHAT" ] }, { "url": "https://github.com/keycloak/keycloak/discussions/25209" }, { "url": "https://github.com/keycloak/keycloak/issues/43020" } ], "datePublic": "2025-10-07T00:00:00.000Z", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-770", "description": "Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE" } ] } ], "x_redhatCweChain": "CWE-770: Allocation of Resources Without Limits or Throttling", "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." } ], "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." } ], "providerMetadata": { "orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-04-20T17:45:58.307Z" }, "x_generator": { "engine": "cvelib 1.8.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2025-12-23T20:51:23.601159Z", "id": "CVE-2025-11419", "options": [ { 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