CVE-2026-52747 (GCVE-0-2026-52747)
Vulnerability from cvelistv5
Published
2026-07-10 21:42
Modified
2026-07-13 17:48
Severity ?
8.6 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
CWE
  • CWE-180 - Incorrect Behavior Order: Validate Before Canonicalize
Summary
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.
References
Impacted products
Vendor Product Version
owasp-modsecurity ModSecurity Version: < 3.0.16
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