Interpretation Conflict in Apache HTTP Server - CVE-2026-42356
Published: October 1, 2026
Vulnerability identifier: #VU153094
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42356
CWE-ID: CWE-436
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to incorrect handler deployment in Apache HTTP Server when processing internal redirects from CGI programs to non-CGI files in CGI-enabled directories. A remote attacker can trigger an internal redirect from a CGI program to execute arbitrary code.
The target file must not have an extension understood by mod_mime.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-42356
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.69