CVE-2026-101356 Apache Tomcat - HTTP/2 request/response mix-up after
error during async processing
Severity: Important
Vendor: The Apache Software Foundation
Versions Affected:
Apache Tomcat 11.0.22 to 11.0.26
Apache Tomcat 10.1.55 to 10.1.60
Apache Tomcat 9.0.118 to 9.0.122
Description:
Incorrect object recycling and re-use affecting HTTP/2 processing of
asynchronous servlets can trigger request and/or response mix-up between
users.
Mitigation:
Users of the affected versions should apply one of the following
mitigations:
- Upgrade to Apache Tomcat 11.0.27
- Upgrade to Apache Tomcat 10.1.61
- Upgrade to Apache Tomcat 9.0.123
History:
2026-10-20 Original advisory
References:
[1] https://tomcat.apache.org/security-11.html
[2] https://tomcat.apache.org/security-10.html
[3] https://tomcat.apache.org/security-9.html
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