Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling when per-message-deflate is used.
This 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.
The 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.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.1.22, which fix the issue.
CVSS Details
- CVSS 3.1 Base Score: 7.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade tomcat-jsp-2.3-apiUpgrade tomcat-libUpgrade tomcat-servlet-4.0-apiUpgrade tomcat-admin-webappsUpgrade tomcat-docs-webappUpgrade tomcat-el-3.0-apiUpgrade tomcat-webappsUpgrade tomcat-jsvcUpgrade tomcat | Oct 19, 2026 | Oct 19, 2026 |
| Apache Tomcat | — | Upgrade Apache Tomcat to the latest available versionUpgrade Apache Tomcat to 11.0.26Upgrade Apache Tomcat to 10.1.60Upgrade Apache Tomcat to 9.0.122 | Sep 24, 2026 | Sep 23, 2026 |
| Redhat_linux | — | No solution exists | Oct 5, 2026 | Sep 23, 2026 |
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