Stack-based buffer overflow in Apache HTTP Server - CVE-2026-109163
Published: November 11, 2026
Vulnerability identifier: #VU165852
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109163
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to corrupt stack memory and potentially cause a denial of service.
The vulnerability exists due to a stack-based buffer overflow in mod_vhost_alias when handling request data. A remote attacker can supply crafted input to overwrite one byte of stack memory and potentially cause a denial of service.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-109163
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.71