# CVE-2026-88041: Apache Tomcat HTTP trailer information leak between requests

Source: https://junglewise.ai/threats/cve-2026-88041-incomplete-cleanup-vulnerability-in-apache-tomcat-allowed-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-88041 · Severity: info · Published 2026-10-20

Apache Tomcat, a widely used Java application server, contains an incomplete cleanup vulnerability that can allow HTTP trailer information from one request to leak into a subsequent request. An attacker making sequential requests to a Tomcat server could potentially access sensitive information intended for a different client or request, leading to data exposure.

Technologies: [Apache Tomcat](https://junglewise.ai/threats/technologies/tomcat). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-88041 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-88041 being exploited in the wild.

**How severe is CVE-2026-88041?** Informational severity, published 20 October 2026.

**Which products and versions are affected?** Apache Tomcat 11.0.0-M23 through 11.0.26, 10.1.27 through 10.1.60, 9.0.92 through 9.0.122.

**Is there a fix for CVE-2026-88041?** Yes: fixed in 11.0.27, 10.1.61, 9.0.123. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-88041 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-88041?** Check whether you run Apache Tomcat at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 11.0.27, 10.1.61, 9.0.123

## Technical details

This is an information disclosure vulnerability affecting HTTP request processing in Apache Tomcat due to insufficient cleanup of trailer fields between requests. The vulnerability exists in versions 11.0.0-M23 through 11.0.26, 10.1.27 through 10.1.60, and 9.0.92 through 9.0.122, and requires an attacker to make sequential HTTP requests to trigger the leak. The attack is network-based with no authentication or user interaction required.

## Affected products

- Apache Tomcat 11.0.0-M23 through 11.0.26, 10.1.27 through 10.1.60, 9.0.92 through 9.0.122

## Timeline

- 2026-10-20: disclosed

## References

- [https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1](https://lists.apache.org/thread.html/dnmm9l3byytg3l66nk1jrqfrl7jty7n1)

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