CVE-2026-52747 — Security Box Score

CVE · referencelatest edition

Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-52747HIGH

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

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  C  N  H  N    8.6   .0052   42.0     —

AFFECTED
  Product      Versions    Fixed
  ModSecurity  < 3.0.16 –  —

TIMELINE
  Jun 8   Reserved by GitHub_M
  Jul 10  EXPLOIT PUBLISHED — CVE-2026-52747 (owasp-modsecurity ModSecurity). Public exploit reference added.
  Jul 10  Published (CNA: GitHub_M)

CWE-180 · CNA: GitHub_M · CVSS v3.1 · 3 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
June 8, 2026	Reserved	Reserved by GitHub_M
July 10, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-52747 (owasp-modsecurity ModSecurity). Public exploit reference added.
July 10, 2026	Published	Published (CNA: GitHub_M)

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
owasp-modsecurity	ModSecurity	—	< 3.0.16	—

Weaknesses

CWE-180

References (3)

https://github.com/owasp-modsecurity/ModSecurity/commit/875504c2758169c41be1ad2f0cc64d896b7815d7 [Patch]
https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.16 [Product, Release Notes]
https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-rcw9-2f5r-7p88 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-52747 at cve.org

Vendors: owasp-modsecurity

Weaknesses: CWE-180

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-52747 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.