{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-78437","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","state":"PUBLISHED","assignerShortName":"apache","dateReserved":"2026-08-24T16:10:49.885Z","datePublished":"2026-09-23T11:26:29.362Z","dateUpdated":"2026-09-23T18:10:46.744Z"},"containers":{"cna":{"providerMetadata":{"orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","shortName":"apache","dateUpdated":"2026-09-23T11:26:29.362Z"},"title":"Apache Tomcat: HTTP/2 DoS via malformed request","problemTypes":[{"descriptions":[{"description":"CWE-459 Incomplete cleanup","lang":"en","cweId":"CWE-459","type":"CWE"}]}],"source":{"discovery":"INTERNAL"},"affected":[{"vendor":"Apache Software Foundation","product":"Apache Tomcat","versions":[{"status":"affected","version":"11.0.19","lessThanOrEqual":"11.0.25","versionType":"semver"},{"status":"affected","version":"10.1.53","lessThanOrEqual":"10.1.59","versionType":"semver"},{"status":"affected","version":"9.0.116","lessThanOrEqual":"9.0.121","versionType":"semver"},{"status":"unaffected","version":"0","lessThanOrEqual":"8.5.100","versionType":"semver"}],"defaultStatus":"unaffected"}],"descriptions":[{"value":"Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.\n\n\n\nUsers are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.","lang":"en","supportingMedia":[{"type":"text/html","base64":false,"value":"<p>Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail.</p><p>This issue affects Apache Tomcat: from 11.0.19 through 11.0.25, from 10.1.53 through 10.1.59, from 9.0.116 through 9.0.121.</p><p>Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.</p>"}]}],"references":[{"url":"https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg","tags":["vendor-advisory"]}],"metrics":[{"other":{"type":"Textual description of severity","content":{"text":"low"}},"scenarios":[{"lang":"en","value":"GENERAL"}]}],"x_generator":{"engine":"Vulnogram 1.0.3"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.3,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","integrityImpact":"LOW","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"LOW","privilegesRequired":"NONE","confidentialityImpact":"LOW"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-09-23T16:25:38.365317Z","id":"CVE-2026-78437","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-23T16:25:54.815Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/26"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-09-23T18:10:46.744Z"}}]}}