CVE-2026-78437

Incomplete cleanup vulnerability in Apache Tomcat allows a malformed request to potentially (depends on timing) cause one request from another user to fail. This 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. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Score

CVSS 3.1 7.3 High

Status

Awaiting Analysis - security@apache.org

Published

2026-09-23

Last modified

2026-09-23

Weaknesses

CWE-459

Affected products

• Apache Tomcat (Apache Software Foundation)

References

• https://lists.apache.org/thread/qkmsos3s8chn5053qr466rzwv6sk5gjg
• http://www.openwall.com/lists/oss-security/2026/09/23/26