{"id":"CVE-2026-42400","summary":"Uncontrolled Resource Consumption in Kibana Leading to Denial of Service","details":"Uncontrolled Resource Consumption (CWE-400) in Kibana can lead to denial of service via Excessive Allocation (CAPEC-130). An authenticated user can send a specially crafted compressed request payload that is processed prior to authorization checks, causing excessive memory and CPU resource consumption that can result in a Kibana instance becoming unresponsive or crashing.","aliases":["BIT-elk-2026-42400","BIT-kibana-2026-42400"],"modified":"2026-06-18T04:13:27.919686824Z","published":"2026-05-28T19:42:11.414Z","database_specific":{"cna_assigner":"elastic","cwe_ids":["CWE-400"],"unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"9.4.0"},{"last_affected":"9.4.1"},{"introduced":"9.0.0"},{"last_affected":"9.3.4"},{"introduced":"8.0.0"},{"last_affected":"8.19.15"}]}],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42400.json"},"references":[{"type":"WEB","url":"https://discuss.elastic.co/t/kibana-8-19-16-9-3-5-9-4-2-security-update-esa-2026-35/386554"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42400.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42400"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/elastic/elasticsearch","events":[{"introduced":"1b6a7ece17463df5ff54a3e1302d825889aa1161"},{"fixed":"0ecfe314ed6ddebb736091bf37b3b6758209b73b"},{"introduced":"112859b85d50de2a7e63f73c8fc70b99eea24291"},{"fixed":"7dcc32bebba091844c0207f9dae8fda6c7d08542"},{"introduced":"2e8528e92361c3399724226deaf2b46f933e925b"},{"fixed":"c402c2b36d90eae29c0182f86bd9050fd0b746cc"}],"database_specific":{"cpe":"cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*","source":"CPE_RANGE","extracted_events":[{"introduced":"8.0.0"},{"fixed":"8.19.16"},{"introduced":"9.0.0"},{"fixed":"9.3.5"},{"introduced":"9.4.0"},{"fixed":"9.4.2"}]}}],"versions":["v9.4.1","v9.4.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42400.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/elastic/kibana","events":[{"introduced":"57ca5e139a33dd2eed927ce98d8231a1f217cd15"},{"fixed":"209c12d77d1bf1bc561abff2b91aa95f354734a3"},{"introduced":"504d6bfa94cca17fabb76e06152c30c4f0c3efdd"},{"fixed":"db396449a69d0613b0b4dc8b8e9789aa35504e0f"},{"introduced":"b2e39752e03b56f48f51943214475ddba1f8e974"},{"fixed":"ca34dedcfe614964fe236c237a023021da0a8665"}],"database_specific":{"cpe":"cpe:2.3:a:elastic:kibana:*:*:*:*:*:*:*:*","source":"CPE_RANGE","extracted_events":[{"introduced":"8.0.0"},{"fixed":"8.19.16"},{"introduced":"9.0.0"},{"fixed":"9.3.5"},{"introduced":"9.4.0"},{"fixed":"9.4.2"}]}}],"versions":["v9.4.1","v9.4.0"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-42400.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}