Input validation error in Foxit PDF Reader for Windows and Foxit PDF Editor (formerly Foxit PhantomPDF) - CVE-2026-5941

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Main Vulnerability Database Vulnerabilities #VU128007

Input validation error in Foxit PDF Reader for Windows and Foxit PDF Editor (formerly Foxit PhantomPDF) - CVE-2026-5941

Published: April 27, 2026


Vulnerability identifier: #VU128007
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-5941
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Foxit Software Inc.
Affected software:
Foxit PDF Reader for Windows
Foxit PDF Editor (formerly Foxit PhantomPDF)

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to improper input validation in malformed form field hierarchy parsing when processing malformed form field hierarchies. A remote attacker can trick the victim into opening a specially crafted document to execute arbitrary code.

The issue results from improper parsing logic that misidentifies non-signature data as valid signatures during internal data structure construction.


How to mitigate CVE-2026-5941

Install security update from vendor's website.

Sources