Medium severity5.8NVD Advisory· Published Jul 10, 2026· Updated Jul 14, 2026
CVE-2026-52761
CVE-2026-52761
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.
Affected products
4- osv-coords2 versions
>= 3.0.0, < 3.0.16+ 1 more
- (no CPE)range: >= 3.0.0, < 3.0.16
- (no CPE)range: >= 3.0.0, < 3.0.16
- Range: 3.0.0 - 3.0.15
Patches
Vulnerability mechanics
References
3News mentions
2- ⚡ Weekly Recap: ShareFile Threat, Citrix Bleed 2 Ransomware, AI Coding Attacks, and MoreThe Hacker News · Jul 13, 2026
- Multiple ModSecurity Vulnerabilities Allow Attackers to Bypass Firewall RulesCyber Security News · Jul 6, 2026