ZDI-26-304: Foxit PDF Reader AcroForm Annotation Use-After-Free Remote Code Execution Vulnerability

Published Apr 27, 2026

Updated

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Foxit PDF Reader. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-5943.

Affected Software

1 affected component

Foxit Foxit PDF Reader

Event History

Apr 27, 2026

Advisory Published

via ZDI·05:00 AM

Data Sourced

via ZDI·05:00 AM

Description

Frequently Asked Questions

What is the severity of ZDI-26-304?

The severity of ZDI-26-304 is critical due to its potential for remote code execution.

How do I fix ZDI-26-304?

To fix ZDI-26-304, update Foxit PDF Reader to the latest version that addresses this vulnerability.

Who is affected by ZDI-26-304?

Users of affected versions of Foxit PDF Reader are susceptible to ZDI-26-304.

What is the impact of ZDI-26-304?

ZDI-26-304 allows remote attackers to execute arbitrary code on vulnerable installations of Foxit PDF Reader.

Is user interaction required to exploit ZDI-26-304?

Yes, user interaction is required as the target must visit a malicious PDF document to exploit ZDI-26-304.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co

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