CVE-2026-101356
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HTTP/2 Request Mix-Up in Apache Tomcat

Publication date: 2026-10-20

Last updated on: 2026-10-20

Assigner: Apache Software Foundation

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.

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Meta Information

Published
2026-10-20
Last Modified
2026-10-20
Generated
2026-11-09
AI Q&A
2026-10-20
EPSS Evaluated
2026-11-08
NVD
CVE-2026-101356
EUVD
EUVD-2026-105011

Affected Vendors & Products

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-362 The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.

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Executive Summary

This vulnerability involves incorrect handling of objects in Apache Tomcat's HTTP/2 processing for asynchronous servlets. It allows requests or responses to be mixed up between different users, potentially causing data to be sent to the wrong user.

Detection Guidance

Detection involves checking Apache Tomcat versions against affected ranges. Use commands like 'catalina.sh version' or 'java -cp catalina.jar org.apache.catalina.util.ServerInfo' to verify installed versions. Compare against 11.0.22-11.0.26, 10.1.55-10.1.60, or 9.0.118-9.0.122. Monitor HTTP/2 traffic for anomalies indicating request/response mix-ups.

Impact Analysis

This vulnerability could lead to unauthorized access to sensitive data, session hijacking, or data leakage if an attacker exploits the request/response mix-up to intercept or manipulate communications between users and the server.

Compliance Impact

This vulnerability could result in non-compliance with GDPR or HIPAA due to unauthorized data exposure or breaches. Organizations may face legal penalties, reputational damage, and loss of trust if user data is compromised through this issue.

Mitigation Strategies

Upgrade Apache Tomcat to version 11.0.27, 10.1.61, or 9.0.123 or later to fix the issue.

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