{"id":"CVE-2026-78437","title":"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 …","summary":"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 …","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","cwe":["CWE-459"],"vendor":"Apache Software Foundation","product":"Apache Tomcat","affected":["apache_tomcat >= 11.0.19 <= 11.0.25","apache_tomcat >= 10.1.53 <= 10.1.59","apache_tomcat >= 9.0.116 <= 9.0.121"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:19:21.640","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78437","references":[{"url":"https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/26","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78437.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-78437"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539533"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-78437"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78437"},{"url":"https://access.redhat.com/errata/RHSA-2026:68257"},{"url":"https://access.redhat.com/errata/RHSA-2026:68258"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T16:25:38.365317Z"},"ingestedAt":"2026-09-23T12:24:04.184Z","epss":0.00511,"epssPercentile":0.43411,"patched":["hardened_images"],"scores":{"nvd":7.3,"vendor":5.3},"slug":"CVE-2026-78437","body":"## Overview\n\nIncomplete 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.\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)","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":209803,"id":"CVE-2026-78437","ts":1790184549252,"field":"cvss","old":null,"new":"7.3"},{"seq":209802,"id":"CVE-2026-78437","ts":1790184549252,"field":"severity","old":"none","new":"high"}]}