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: 8.4 [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]
CVE-ID: CVE-2026-5943
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 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.
Affected software
Foxit PDF Editor (formerly Foxit PhantomPDF)
Foxit PDF Reader for Windows
Foxit PDF Reader for Windows
How to mitigate CVE-2026-5943
Install security update from vendor's website.
Foxit PDF Editor (formerly Foxit PhantomPDF) - addressed in versions 13.2.4.24048, 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