{"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": "2026-09-23T11:26:29.362Z"}, "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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache Tomcat", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "11.0.25", "status": "affected", "version": "11.0.19", "versionType": "semver"}, {"lessThanOrEqual": "10.1.59", "status": "affected", "version": "10.1.53", "versionType": "semver"}, {"lessThanOrEqual": "9.0.121", "status": "affected", "version": "9.0.116", "versionType": "semver"}, {"lessThanOrEqual": "8.5.100", "status": "unaffected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-78437", "lastModified": "2026-09-23T12:17:07.340", "metrics": {}, "published": "2026-09-23T12:17:07.340", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-459"}], "source": "security@apache.org", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.19,11.0.25]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.1.53,10.1.59]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.116,9.0.121]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,8.5.100]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Apache Tomcat", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "apache_tomcat", "vendor": "apache"}], "created": "2026-09-23T13:45:04.554594+00:00", "updated": "2026-09-23T13:45:04.890330+00:00", "vendors": ["apache", "apache$PRODUCT$apache_tomcat"]}