CVE-2026-52747— owasp-modsecurity ModSecurity 处理逻辑错误漏洞

ModSecurity: Multipart form-data parser silently strips embedded line breaks from form-field values, enabling request-body inspection bypass

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

不正确的行为次序：规范化之前验证

owasp-modsecurity ModSecurity 处理逻辑错误漏洞

owasp-modsecurity ModSecurity是owasp-modsecurity的Web应用防火墙模块。 owasp-modsecurity ModSecurity 3.0.16之前版本存在处理逻辑错误漏洞，该漏洞源于libmodsecurity中multipart/form-data请求体解析器在导出非文件表单字段值至ARGS和ARGS_POST时静默删除嵌入换行符，而非追加当前缓冲区，导致解析差异，可能使依赖换行符的危险语法被安全规则忽略。

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