Use-after-free in Foxit PDF Editor (formerly Foxit PhantomPDF) and Foxit PDF Reader for Windows - CVE-2026-5939
Published: April 27, 2026
Vulnerability identifier: #VU128006
CSH Severity: Medium
CVSS v4: 4.6 [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]
CVE-ID: CVE-2026-5939
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Foxit PDF Editor (formerly Foxit PhantomPDF)
Foxit PDF Reader for Windows
Foxit PDF Reader for Windows
How to mitigate CVE-2026-5939
Install security update from vendor's website.
Foxit PDF Editor (formerly Foxit PhantomPDF) - addressed in versions 14.0.4.33508, 2026.1.1.36485
Foxit PDF Reader for Windows - update to 2026.1.1.36485
Foxit PDF Reader for Windows - update to 2026.1.1.36485