Use-after-free in Foxit PDF Reader for Windows and Foxit PDF Editor (formerly Foxit PhantomPDF) - CVE-2026-5939

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Main Vulnerability Database Vulnerabilities #VU128006

Use-after-free in Foxit PDF Reader for Windows and Foxit PDF Editor (formerly Foxit PhantomPDF) - CVE-2026-5939

Published: April 27, 2026


Vulnerability identifier: #VU128006
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-5939
CWE-ID: CWE-416
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 use-after-free in XFA file, annotation, or signature object handling when parsing crafted XFA files or crafted annotation or signature objects. A remote attacker can trick the victim into opening a specially crafted document to execute arbitrary code.

The issue may also lead to information disclosure.


How to mitigate CVE-2026-5939

Install security update from vendor's website.

Sources