Severity: important
Affected versions:
- Apache Tomcat 11.0.22 through 11.0.25
- Apache Tomcat 10.1.55 through 10.1.59
- Apache Tomcat 9.0.118 through 9.0.121
Description:
Inconsistent interpretation of HTTP/2 requests ('HTTP Request/Response
smuggling') vulnerability in Apache Tomcat caused by a regression in fix
for CVE-2026-41293 can trigger request header mix-up.
This issue affects Apache Tomcat: from 11.0.22 through 11.0.25, from
10.1.55 through 10.1.59, from 9.0.118 through 9.0.121.
Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122,
which fix the issue.
Credit:
Jeppe Weikop (finder)
References:
https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswc
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-86350
