CVE-2026-91793: Foxit PDF Editor/Reader Doc Object Use-After-Free Information Disclosure Vulnerability
Published Sep 23, 2026
·Updated
When opening a specially crafted PDF, Foxit PDF Editor/Reader executes scripts that modify annotation rich-text attributes containing malformed font data. During subsequent annotation appearance reconstruction, it accesses an object after it has been released, resulting in a use-after-free condition and an application crash.
Affected Software
9 affected components
Foxit PDF Editor/Reader
All of the following
Any of the following
Foxit PDF Editor<=13.2.5.63482
Foxit PDF Editor>=14.0.0.33046<=14.0.7.33751
Foxit PDF Editor>=2023.1.0.15510<=2023.3.0.23028
Foxit PDF Editor>=2024.1.0.23997<=2024.4.1.27687
Foxit PDF Editor>=2025.1.0.27937<=2025.3.0.35737
Foxit PDF Editor>=2026.1.0.36452<=2026.2.0.39747
Foxit PDF Reader<=2026.2.0.39747
Microsoft Windows
Event History
Sep 23, 2026
CVE Published
via MITRE·07:51 AM
Data Sourced
via MITRE·07:51 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·08:17 AM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What must an attacker do to trigger this issue?
The attacker must persuade a user to open a specially crafted PDF. The PDF uses scripts to modify annotation rich-text attributes with malformed font data.
2
What is the observed impact after the malicious PDF is opened?
During annotation appearance reconstruction, the application accesses an object after it has been released. The described result is a use-after-free condition and an application crash.