Inconsistent interpretation of HTTP requests in Apache Tomcat - CVE-2026-86350
Published: September 23, 2026
Vulnerability identifier: #VU151839
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-86350
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a request header mix-up.
The vulnerability exists due to inconsistent interpretation of HTTP/2 requests in HTTP/2 request processing when handling HTTP/2 requests. A remote attacker can send a crafted HTTP/2 request to cause a request header mix-up.
The issue is a regression in the fix for CVE-2026-41293.
Affected software
Apache Tomcat
How to mitigate CVE-2026-86350
Install security update from vendor's website.
Apache Tomcat - addressed in versions 9.0.122, 10.1.60, 11.0.26