{"id":"CVE-2024-11734","aliases":["EUVD-2025-0048","GHSA-w3g8-r9gw-qrh8"],"status":"published","title":"Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers","description":"A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00945,"percentile":0.61377,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-693"],"published":"2025-01-13T16:58:23Z","modified":"2026-10-28T02:30:45Z","fixes":[{"ecosystem":"Maven","package":"org.keycloak:keycloak-quarkus-server","fixed_in":["26.0.8"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Maven","package":"org.keycloak:keycloak-quarkus-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.0.8"}]}]},{"source":"osv","ecosystem":"Maven","package":"org.keycloak:keycloak-quarkus-server","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.0.8"}]}],"versions":["12.0.0","12.0.1","12.0.2","12.0.3","12.0.4","13.0.0","13.0.1","14.0.0","15.0.0","15.0.1","15.0.2","15.1.0","15.1.1","16.0.0","16.1.0","16.1.1","17.0.0","17.0.1","18.0.0","18.0.1","18.0.2","19.0.0","19.0.1","19.0.2","19.0.3","20.0.0","20.0.1","20.0.2","20.0.3","20.0.4","20.0.5","21.0.0","21.0.1","21.0.2","21.1.0","21.1.1","21.1.2","22.0.0","22.0.1","22.0.2","22.0.3","22.0.4","22.0.5","23.0.0","23.0.1","23.0.2","23.0.3","23.0.4","23.0.5","23.0.6","23.0.7","24.0.0","24.0.1","24.0.2","24.0.3","24.0.4","24.0.5","25.0.0","25.0.1","25.0.2","25.0.3","25.0.4","25.0.5","25.0.6","26.0.0","26.0.1","26.0.2","26.0.4","26.0.5","26.0.6","26.0.7"]}],"products":[{"vendor":"red hat","product":"red hat build of keycloak"},{"vendor":"red hat","product":"red hat build of keycloak 26.0"},{"vendor":"red hat","product":"red hat jboss enterprise application platform 8"},{"vendor":"red hat","product":"red hat jboss enterprise application platform expansion pack"},{"vendor":"red hat","product":"rhbk 26.0.8"}],"references":[{"url":"https://access.redhat.com/errata/RHSA-2025:0299","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/errata/RHSA-2025:0300","tags":["vendor-advisory","x_refsource_REDHAT","advisory","web"]},{"url":"https://access.redhat.com/security/cve/CVE-2024-11734","tags":["vdb-entry","x_refsource_REDHAT","advisory","web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2328846","tags":["issue-tracking","x_refsource_REDHAT","report","web"]},{"url":"https://github.com/keycloak/keycloak/security/advisories/GHSA-w3g8-r9gw-qrh8","tags":["web"]},{"url":"https://github.com/keycloak/keycloak/commit/93b2a7327b2557eb132a8169086c5e63c81dff79","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2024-11734","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-w3g8-r9gw-qrh8"},{"url":"https://access.redhat.com/downloads/content/package-browser/","tags":["web"]},{"url":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","tags":["web"]},{"url":"https://catalog.redhat.com/software/containers/","tags":["web"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/11xxx/CVE-2024-11734.json","tags":["advisory"]},{"url":"https://github.com/keycloak/keycloak","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2024-11734","title":"Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers","description":"A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.","status":"published","published":"2025-01-14T08:35:42.107Z","modified":"2026-08-31T00:27:52.546Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:34:19.28149Z"}],"euvd":[{"id":"EUVD-2025-0048","description":"A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.","status":"published","published":"2025-01-14T08:35:42Z","modified":"2026-08-31T00:27:52Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T18:01:21.466916Z"}],"ghsa":[{"id":"GHSA-w3g8-r9gw-qrh8","title":"Denial of Service in Keycloak Server via Security Headers","description":"A potential Denial of Service (DoS) vulnerability has been identified in Keycloak, which could allow an administrative user with the rights to change realm settings to disrupt the service. This is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that is already terminated, leading to a failure of said request.\n\nService disruption may happen, users will be unable to access applications relying on Keycloak, or any of the consoles provided by Keycloak itself on the affected realm.","status":"published","published":"2025-01-13T16:58:23Z","modified":"2025-01-14T16:38:59Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:38:27.067633Z"}],"nvd":[{"id":"CVE-2024-11734","description":"A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.","status":"published","published":"2025-01-14T09:15:19.443Z","modified":"2026-08-31T01:16:43.687Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T14:10:42.329342Z"}],"osv":[{"id":"CVE-2024-11734","title":"Org.keycloak:keycloak-quarkus-server: denial of service in keycloak server via security headers","description":"A denial of service vulnerability was found in Keycloak that could allow an administrative user with the right to change realm settings to disrupt the service. This action is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that has already been terminated, leading to the failure of said request.","status":"published","published":"2025-01-14T08:35:42.107Z","modified":"2026-10-28T02:30:45.788528926Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:44:37.917085Z"},{"id":"GHSA-w3g8-r9gw-qrh8","title":"Denial of Service in Keycloak Server via Security Headers","description":"A potential Denial of Service (DoS) vulnerability has been identified in Keycloak, which could allow an administrative user with the rights to change realm settings to disrupt the service. This is done by modifying any of the security headers and inserting newlines, which causes the Keycloak server to write to a request that is already terminated, leading to a failure of said request.\n\nService disruption may happen, users will be unable to access applications relying on Keycloak, or any of the consoles provided by Keycloak itself on the affected realm.","status":"published","published":"2025-01-13T16:58:23Z","modified":"2026-09-10T03:50:22.205864348Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-693"],"updated_at":"2026-11-02T15:46:58.04805Z"}]}}