CVE-2025-52891: Owasp-Modsecurity Modsecurity

Medium severity, CVSS 6.5. EPSS: 0.4% 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. In versions 2.9.8 to before 2.9.11, an empty XML tag can cause a segmentation fault. If SecParseXmlIntoArgs is set to On or OnlyArgs, and the request type is application/xml, and at least one XML tag is empty (eg <foo></foo>), then a segmentation fault occurs. This issue has been patched in version 2.9.11. A workaround involves setting SecParseXmlIntoArgs to Off.

Affected products

Published 2025-07-02. Last modified 2026-06-17.