---
id: CVE-2026-101356
title: >-
  Apache Tomcat: HTTP/2 request/response mix-up after error during async
  processing
summary: >-
  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…
severity: none
vendor: Apache Software Foundation
product: Apache Tomcat
affected:
  - apache_tomcat >= 11.0.22 <= 11.0.26
  - apache_tomcat >= 10.1.55 <= 10.1.60
  - apache_tomcat >= 9.0.118 <= 9.0.122
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T13:46:50.842Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-101356'
references:
  - url: 'https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27'
tags:
  - cve.org
ingestedAt: '2026-10-20T14:08:00.569Z'
---

## Overview

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.

## Affected

- `apache_tomcat >= 11.0.22 <= 11.0.26`
- `apache_tomcat >= 10.1.55 <= 10.1.60`
- `apache_tomcat >= 9.0.118 <= 9.0.122`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.