Use of sizeof() on a Pointer Type in ModSecurity - CVE-2026-52761
Published: June 29, 2026
Vulnerability identifier: #VU135852
CSH Severity: Medium
CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-52761
CWE-ID: CWE-467
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass security rules.
The vulnerability exists due to use of sizeof() on a pointer type in the t:utf8toUnicode transformation when processing UTF-8 input on i386 architecture. A remote attacker can send specially crafted input to bypass security rules.
Only i386 architecture is affected.
Affected software
ModSecurity
How to mitigate CVE-2026-52761
Install security update from vendor's website.
ModSecurity - update to 3.0.16