CVE-2026-101356 Apache Tomcat: HTTP/2 request/response mix-up after error during async processing
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-101356?
CVE-2026-101356 is a critical vulnerability in Apache Tomcat, published on 20 Oct 2026.
Official 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.
Weakness: CWE-362
Which versions are affected by CVE-2026-101356?
1 open source package ship an affected version, including tomcat.
| Package | Affected | Fixed in |
|---|---|---|
tomcat Bitnami | From 9.0.118 | 9.0.123, 10.1.61, 11.0.27 |
How do I fix CVE-2026-101356?
Upgrade tomcat to a fixed version for your release line: 9.0.123, 10.1.61 or 11.0.27.
Is CVE-2026-101356 being exploited?
There is no known exploitation of CVE-2026-101356 in the wild and no public exploit code.
Sources
Also known as BIT-tomcat-2026-101356, DEBIAN-CVE-2026-101356, GHSA-w9r8-5j45-v8mg, UBUNTU-CVE-2026-101356.