CVE-2026-86350

Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up

State: Published
Severity: 9.1 Critical
Published: Sep 23, 2026
Updated: Sep 23, 2026
Reserved: Sep 7, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	9.1 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-444 Inconsistent interpretation of HTTP requests ('HTTP Request/Response smuggling')

Affected Products

Product	Versions
Apache TomcatApache Software Foundation	11.0.22 through 11.0.25Affected 10.1.55 through 10.1.59Affected 9.0.118 through 9.0.121Affected

References

https://lists.apache.org/thread/mss45z99lcdd5dtpgcn45dy82f3toswcvendor-advisory

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