CVE-2026-52747
ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Prior to 3.0.16, the multipart/form-data request body parser in libmodsecurity silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST because src/request_body_processor/multipart.cc overwrites reserved bytes in m_reserve instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve line breaks in form fields, allowing rules that inspect ARGS or ARGS_POST to miss payloads whose dangerous syntax depends on a line break. This issue is fixed in version 3.0.16.
- Affected products
- Modsecurity
- Owasp Modsecurity
- < 3.0.16
- Fix
- Available
- CVSS 3.1
- 8.6 HIGH
- EPSS
- 0.5% (41th percentile)
- Weakness
- CWE-180
- NVD status
- Analyzed
- Published
- 2026-07-10
No indexed exploits for CVE-2026-52747 yet
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No exploit for CVE-2026-52747 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.