CVE-2026-52747
HIGH
MEDIUM
Priority: 0.04
BB Relevance:
77/100
Published: 2026-07-10
Modified: 2026-10-25
First seen: 2026-10-29
Status: active
Attack Surface
Network
Low Complexity
No Auth
No Interaction
Integ. Impact
Scope Change
CVSS Vector Breakdown
AV:
Network
AC:
Low
PR:
None
UI:
None
S:
Changed
C:
None
I:
High
A:
None
Description
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.
Weakness Classification (1)
Affected Software (1)
| Vendor | Product | Version |
|---|---|---|
| owasp | modsecurity | < 3.0.16 |
References & Advisories (3)
Product
Release Notes
Patch
Exploit
Mitigation
Vendor Advisory