{"id":"CVE-2026-87022","title":"Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling when per-message-deflate is used.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 t…","summary":"Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling when per-message-deflate is used.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 t…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","cwe":["CWE-130"],"vendor":"Apache Software Foundation","product":"Apache Tomcat","affected":["apache_tomcat >= 11.0.0-M1 <= 11.0.25","apache_tomcat >= 10.1.0-M1 <= 10.1.59","apache_tomcat >= 9.0.0.M1 <= 9.0.121","apache_tomcat >= 8.5.0 <= 8.5.100","apache_tomcat >= 7.0.56 <= 7.0.109"],"published":"2026-09-23","updated":"2026-09-23","sourceUpdated":"2026-09-23T19:19:42.183","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87022","references":[{"url":"https://lists.apache.org/thread/ypvlkjqsq0480fnk9jm6h9qllddwlw4w","label":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/30","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-23T14:27:17.688403Z"},"ingestedAt":"2026-09-23T12:24:04.187Z","epss":0.00422,"epssPercentile":0.33887,"slug":"CVE-2026-87022","body":"## Overview\n\nImproper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling when per-message-deflate is used.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.\n\n\n\nThe following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.56 through 7.0.109. Other unsupported versions may also be affected.\n\n\n\nUsers are recommended to upgrade to version 11.0.26, 10.1.60 or 9.1.22, which fix the issue.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":209737,"id":"CVE-2026-87022","ts":1790177231502,"field":"cvss","old":null,"new":"7.5"},{"seq":209736,"id":"CVE-2026-87022","ts":1790177231502,"field":"severity","old":"none","new":"high"}]}