Vulnerability Details CVE-2026-52761
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.004
EPSS Ranking 35.4%
CVSS Severity
CVSS v3 Score 5.8
References
Products affected by CVE-2026-52761
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cpe:2.3:a:owasp:modsecurity:3.0.0
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cpe:2.3:a:owasp:modsecurity:3.0.1
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cpe:2.3:a:owasp:modsecurity:3.0.10
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cpe:2.3:a:owasp:modsecurity:3.0.11
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cpe:2.3:a:owasp:modsecurity:3.0.12
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cpe:2.3:a:owasp:modsecurity:3.0.13
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cpe:2.3:a:owasp:modsecurity:3.0.14
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cpe:2.3:a:owasp:modsecurity:3.0.2
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cpe:2.3:a:owasp:modsecurity:3.0.3
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cpe:2.3:a:owasp:modsecurity:3.0.4
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cpe:2.3:a:owasp:modsecurity:3.0.5
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cpe:2.3:a:owasp:modsecurity:3.0.6
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cpe:2.3:a:owasp:modsecurity:3.0.8
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cpe:2.3:a:owasp:modsecurity:3.0.9