{"id":"CVE-2026-86350","state":"PUBLISHED","title":"Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up","description":"Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression 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.","publishedAt":"2026-09-23T11:31:36.328Z","updatedAt":"2026-09-23T16:17:11.408Z","severity":{"score":9.1,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"CISA-ADP"},"assigner":"apache","products":["Apache Software Foundation Apache Tomcat"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Tomcat","defaultStatus":"unaffected","versions":[{"version":"11.0.22","status":"affected","lessThanOrEqual":"11.0.25","versionType":"semver"},{"version":"10.1.55","status":"affected","lessThanOrEqual":"10.1.59","versionType":"semver"},{"version":"9.0.118","status":"affected","lessThanOrEqual":"9.0.121","versionType":"semver"}]}],"references":["https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc"],"weaknesses":["CWE-444"],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/86xxx/CVE-2026-86350.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-86350","state":"PUBLISHED","datePublished":"2026-09-23T11:31:36.328Z","dateUpdated":"2026-09-23T16:17:11.408Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2026-09-07T09:49:48.382Z"},"containers":{"cna":{"title":"Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up","descriptions":[{"lang":"en","value":"Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response smuggling') vulnerability in Apache Tomcat caused by a regression 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."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Tomcat","defaultStatus":"unaffected","versions":[{"version":"11.0.22","status":"affected","lessThanOrEqual":"11.0.25","versionType":"semver"},{"version":"10.1.55","status":"affected","lessThanOrEqual":"10.1.59","versionType":"semver"},{"version":"9.0.118","status":"affected","lessThanOrEqual":"9.0.121","versionType":"semver"}]}],"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"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-444","description":"CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateUpdated":"2026-09-23T11:31:36.328Z"},"source":{"discovery":"EXTERNAL"},"credits":[{"lang":"en","value":"Jeppe Weikop","type":"finder"}],"x_generator":{"engine":"Vulnogram 1.0.3"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-23T16:17:11.408Z"}}]}}}