CVE-2026-101356
Received Received - Intake

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
2026-10-20
AI Q&A
2026-10-20
EPSS Evaluated
N/A
NVD
CVE-2026-101356
EUVD
EUVD-2026-105011

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
Apache Software Foundation Apache Tomcat 11.0.22
Apache Software Foundation Apache Tomcat 10.1.55
Apache Software Foundation Apache Tomcat 9.0.118

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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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.

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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