CVE-2026-101356

Incorrect object recycling and re-use vulnerability in Apache Tomcat affecting HTTP/2 processing of asynchronous servlets can trigger request and/or response mix-up between users. This issue affects Apache Tomcat: from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, from 9.0.118 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fixes the issue.

Score

CVSS 3.1 9.1 Critical

Status

Awaiting Analysis - security@apache.org

Published

2026-10-20

Last modified

2026-10-20

Weaknesses

CWE-362

Affected products

• Apache Tomcat (Apache Software Foundation)

References

• https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27
• http://www.openwall.com/lists/oss-security/2026/10/20/27