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CVE-2026-86350

CriticalPublished

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

Published: Sep 23, 2026
Updated: Sep 23, 2026
Assigning CNA: apache
Evidence observed: Sep 26, 2026

Primary CVSS

9.1/ 10Critical

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Summary

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.

Sources

CVE-2026-86350PoC
Disclosure pack and PoC for CVE-2026-86350, an unauthenticated HTTP/2 request header mix-up (CWE-444) in Apache Tomcat 9.0.121, with lab reproduction and patch guidance.

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