CVE-2026-42268: Owasp Modsecurity

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is an unhandled exception (std::out_of_range) caused by unsigned integer underflow in libmodsecurity3 if the user (administrator) uses a rule any of @verifySSN, @verifyCPF, or @verifySVNR. This vulnerability is fixed in 3.0.15.

Affected products

• Owasp Modsecurity: from 3.0.0, before 3.0.15 (fixed in 3.0.15)

Published 2026-05-12. Last modified 2026-06-17.