CVE-2026-103119 Apache Tomcat: AJP response mix-up
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-103119?
CVE-2026-103119 is a critical vulnerability in Apache Tomcat, published on 20 Oct 2026.
Official description
Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second.
This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26.
Users are recommended to upgrade to version 11.0.27, which fixes the issue.
Weakness: CWE-127
Which versions are affected by CVE-2026-103119?
1 open source package ship an affected version, including tomcat.
| Package | Affected | Fixed in |
|---|---|---|
tomcat Bitnami | From 11.0.0 | 11.0.27 |
How do I fix CVE-2026-103119?
Upgrade tomcat to 11.0.27 or later.
Is CVE-2026-103119 being exploited?
There is no known exploitation of CVE-2026-103119 in the wild and no public exploit code.
Sources
Also known as BIT-tomcat-2026-103119, DEBIAN-CVE-2026-103119, GHSA-64hx-4gc9-f6v4, UBUNTU-CVE-2026-103119.