Use-after-free in Foxit PDF Editor (formerly Foxit PhantomPDF) and Foxit PDF Reader for Windows - CVE-2026-5943

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Main Vulnerability Database Vulnerabilities #VU128004

Use-after-free in Foxit PDF Editor (formerly Foxit PhantomPDF) and Foxit PDF Reader for Windows - CVE-2026-5943

Published: April 27, 2026


Vulnerability identifier: #VU128004
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-2026-5943
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Foxit Software Inc.
Affected software:
Foxit PDF Editor (formerly Foxit PhantomPDF)
Foxit PDF Reader for Windows

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in Annotation objects or Signature objects when handling certain Annotation objects or Signature objects. A remote attacker can trick the victim into opening a crafted document to execute arbitrary code.

User interaction is required to open a crafted document.


How to mitigate CVE-2026-5943

Install security update from vendor's website.

Sources