CVE-2026-52761
ModSecurity: Transformation utf8toUnicode produces wrong output on i386 architecture
CVSS Score
5.8
EPSS Score
0.4%
EPSS Percentile
35th
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.
| CWE | CWE-467 |
| Vendor | owasp-modsecurity |
| Product | modsecurity |
| Published | Jul 10, 2026 |
| Last Updated | Jul 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
owasp-modsecurity / ModSecurity
>= 3.0.0, < 3.0.16