CVE-2026-5939: UAF in Foxit PDF Editor/Reader via XFA calculate event

Q: What is the severity of CVE-2026-5939?

CVE-2026-5939 is considered a critical vulnerability due to its potential for arbitrary code execution.

Q: How do I fix CVE-2026-5939?

To fix CVE-2026-5939, update to the latest version of Foxit PDF Editor or Foxit Reader provided by the vendor.

Q: What types of systems are affected by CVE-2026-5939?

CVE-2026-5939 affects both Foxit PDF Editor and Foxit Reader without specific version limitations.

Q: What is a use-after-free condition in CVE-2026-5939?

In CVE-2026-5939, a use-after-free condition occurs when the application tries to access memory that has already been freed, leading to crashes or potential exploits.

Q: What are the potential consequences of CVE-2026-5939?

The potential consequences of CVE-2026-5939 include application crashes and the execution of arbitrary code by an attacker.

Published Apr 27, 2026

Updated

A crafted XFA PDF can trigger a use-after-free condition during calculate event processing, causing the application to crash and resulting in an arbitrary code execution.

Affected Software

5 affected components

Foxit Foxit PDF Editor

Foxit Foxit Reader

Foxit PDF Editor>=14.0.0<14.0.4

Foxit PDF Editor>=2023.0.0<2026.1.1

Foxit PDF Reader<2026.1.1

Event History

Apr 27, 2026

CVE Published

via MITRE·11:00 AM

Data Sourced

via MITRE·11:00 AM

DescriptionSeverityWeakness

Data Sourced

via NVD·12:16 PM

DescriptionSeverityWeaknessAffected Software

Oct 6, 58306

Event

via FIRST·04:27 PM

Frequently Asked Questions

What is the severity of CVE-2026-5939?

CVE-2026-5939 is considered a critical vulnerability due to its potential for arbitrary code execution.

How do I fix CVE-2026-5939?

To fix CVE-2026-5939, update to the latest version of Foxit PDF Editor or Foxit Reader provided by the vendor.

What types of systems are affected by CVE-2026-5939?

CVE-2026-5939 affects both Foxit PDF Editor and Foxit Reader without specific version limitations.

What is a use-after-free condition in CVE-2026-5939?

In CVE-2026-5939, a use-after-free condition occurs when the application tries to access memory that has already been freed, leading to crashes or potential exploits.

What are the potential consequences of CVE-2026-5939?

The potential consequences of CVE-2026-5939 include application crashes and the execution of arbitrary code by an attacker.

Company

Resources

Contact

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

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