Use-After-Free Vulnerability in Foxit PDF Editor/Reader's Form Fields Processing
CVE-2026-91809

7.8HIGH

Key Information:

Vendor

Foxit Inc.

Status
Foxit PDF Editor
Foxit
Vendor
CVE Published:
23 September 2026

What is CVE-2026-91809?

A use-after-free vulnerability exists in Foxit PDF Editor/Reader, specifically in how it processes malformed PDF form fields. This flaw stems from inadequate validation during field-name traversal, which can lead the application to access an object that has already been released. Consequently, this results in unexpected behavior, including potential crashes of the application, posing risks to both user data and application stability.

Affected Version(s)

Foxit PDF Editor Windows Versions 2026.2 and earlier

Foxit PDF Editor Windows Versions 14.0.7 and earlier

Foxit PDF Editor Windows Versions 13.2.6 and earlier

References

https://www.foxit.com/support/security-bulletins.html

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Anonymous working with TrendAI Zero Day Initiative
.