{"id":"CVE-2026-86350","title":"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: fr…","summary":"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: fr…","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-444"],"vendor":"Apache Software Foundation","product":"Apache Tomcat","affected":["apache_tomcat >= 11.0.22 <= 11.0.25","apache_tomcat >= 10.1.55 <= 10.1.59","apache_tomcat >= 9.0.118 <= 9.0.121"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T17:58:26.570","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-86350","references":[{"url":"https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc","label":"security@apache.org"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86350.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-86350"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539370"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-86350"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86350"},{"url":"https://access.redhat.com/errata/RHSA-2026:68257"},{"url":"https://access.redhat.com/errata/RHSA-2026:68258"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-23T16:16:46.410403Z"},"ingestedAt":"2026-09-23T12:24:04.187Z","epss":0.00483,"epssPercentile":0.4146,"exploits":{"github":1,"githubRepos":["https://github.com/abraxas/CVE-2026-86350"],"checkedAt":"2026-10-27T19:18:53.038Z"},"exploitAvailable":true,"patched":["hardened_images"],"scores":{"nvd":9.1,"vendor":7.2},"slug":"CVE-2026-86350","body":"## Overview\n\nInconsistent 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:68257** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68257)\n- **RHSA-2026:68258** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68258)\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat JBoss Web Server 5, Red Hat JBoss Web Server 6, Red Hat JBoss Web Server 7 · no fix planned: Red Hat JBoss Web Server 5, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, … · updated 2026-10-01 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-86350.json)","depth":"abyssal","depthScore":62,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":211360,"id":"CVE-2026-86350","ts":1790418007582,"field":"exploit_available","old":"false","new":"true"},{"seq":209782,"id":"CVE-2026-86350","ts":1790180884555,"field":"cvss","old":null,"new":"9.1"},{"seq":209781,"id":"CVE-2026-86350","ts":1790180884555,"field":"severity","old":"none","new":"critical"}]}