Incorrect Behavior Order: Early Validation Affecting mod_security package, versions *


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.52% (42nd percentile)

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  • Snyk IDSNYK-RHEL9-MODSECURITY-17950245
  • published11 Jul 2026
  • disclosed10 Jul 2026

Introduced: 10 Jul 2026

CVE-2026-52747  (opens in a new tab)
CWE-179  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:9 mod_security.

NVD Description

Note: Versions mentioned in the description apply only to the upstream mod_security package and not the mod_security package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

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 Base Scores

version 3.1