CVE-2026-101356

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

Apache Tomcat

PublishedOct 20, 2026

First seenOct 20, 2026

Weakness typeCWE-362Race condition

How to fix

Vendor advisories

lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27

Affected products

Product	Affected versions	Fixed in
Apache Software Foundation Apache Tomcat	11.0.22 ≤ v ≤ 11.0.26, 10.1.55 ≤ v ≤ 10.1.60, 9.0.118 ≤ v ≤ 9.0.122	—

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