{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-86350", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-09-07T09:49:48.382Z", "datePublished": "2026-09-23T11:31:36.328Z", "dateUpdated": "2026-09-23T16:17:11.408Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-09-23T11:31:36.328Z"}, "title": "Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up", "problemTypes": [{"descriptions": [{"description": "CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')", "lang": "en", "cweId": "CWE-444", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Tomcat", "versions": [{"status": "affected", "version": "11.0.22", "lessThanOrEqual": "11.0.25", "versionType": "semver"}, {"status": "affected", "version": "10.1.55", "lessThanOrEqual": "10.1.59", "versionType": "semver"}, {"status": "affected", "version": "9.0.118", "lessThanOrEqual": "9.0.121", "versionType": "semver"}], "defaultStatus": "unaffected"}], "descriptions": [{"value": "Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a\u00a0regression in fix for CVE-2026-41293 can trigger request header mix-up.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 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>Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a&nbsp;regression in fix for CVE-2026-41293 can trigger request header mix-up.</p><p>This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 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/mss45z99lcdd5dtpgcn45dy82f3toswc", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "important"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "Jeppe Weikop", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.1, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-09-23T16:16:46.410403Z", "id": "CVE-2026-86350", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-23T16:17:11.408Z"}}]}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Apache Tomcat", "vendor": "Apache Software Foundation", "versions": [{"lessThanOrEqual": "11.0.25", "status": "affected", "version": "11.0.22", "versionType": "semver"}, {"lessThanOrEqual": "10.1.59", "status": "affected", "version": "10.1.55", "versionType": "semver"}, {"lessThanOrEqual": "9.0.121", "status": "affected", "version": "9.0.118", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a\u00a0regression in fix for CVE-2026-41293 can trigger request header mix-up.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from 10.1.55 through 10.1.59, from 9.0.118 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-2026-86350", "lastModified": "2026-09-23T12:17:08.350", "metrics": {}, "published": "2026-09-23T12:17:08.350", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "security@apache.org", "type": "Primary"}]}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.22,11.0.25]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.1.55,10.1.59]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.0.118,9.0.121]"}}], "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": "2026-09-23T13:45:04.554148+00:00", "updated": "2026-09-23T13:45:04.889712+00:00", "vendors": ["apache", "apache$PRODUCT$apache_tomcat"]}