CVE-2026-52761 Details
Description
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 through 3.0.15, the t:utf8toUnicode transformation in src/actions/transformations/utf8_to_unicode.cc produces wrong output on i386 architecture because snprintf uses sizeof on a char pointer rather than the length of the unicode buffer, allowing rules that use this transformation to be bypassed on i386 architecture. This issue is fixed in version 3.0.16.
A vulnerability in ModSecurity versions 3.0.0 through 3.0.15 on i386 architecture allows for bypassing rules that utilize the 't:utf8toUnicode' transformation. The issue arises because the transformation's implementation in 'utf8_to_unicode.cc' incorrectly uses the size of a pointer instead of the actual length of the unicode buffer when converting UTF-8 to Unicode. This flaw can be exploited to manipulate how data is processed by the web application firewall, potentially leading to unintended behavior or security gaps.
Users can upgrade to ModSecurity version 3.0.16, where this issue has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 13, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-467 | Use of sizeof() on a Pointer Type | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| owasp modsecurity | >= 3.0.0, <= 3.0.15 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | Initial Analysis | [email protected] |
| Jul 13, 2026 | CVE Modified | CISA-ADP |
| Jul 10, 2026 | New CVE Received | [email protected] |