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CVE-2026-52747 is a request-inspection integrity flaw in OWASP ModSecurity libmodsecurity affecting versions prior to 3.0.16. The vulnerability resides in the multipart/form-data request body parser, which silently removes embedded line breaks from non-file form-field values before exporting them to ARGS and ARGS_POST. The root cause is a logic error in src/request_body_processor/multipart.cc where reserved bytes in m_reserve are overwritten instead of appending the current buffer. This creates a parser differential between ModSecurity and backend applications that preserve carriage return and line feed characters in form fields. As a result, ModSecurity rules evaluating ARGS or ARGS_POST may inspect a normalized value that differs from the value actually processed by the application, enabling malicious syntax that depends on preserved line breaks to evade detection.
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A vulnerability in ModSecurity's multipart/form-data parser that strips embedded line breaks from non-file form fields before exporting them to ARGS and ARGS_POST, creating a parser differential that can let WAF rules miss malicious payloads dependent on line breaks.
A high-severity vulnerability in libmodsecurity's multipart/form-data parser that strips embedded line breaks from non-file form fields during inspection, enabling request inspection bypass through parser mismatch.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.