Heap-based Out-of-Bounds Write Vulnerability in Foxit PDF Editor/Reader
CVE-2026-91804

7.8HIGH

Key Information:

Vendor

Foxit Inc.

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

What is CVE-2026-91804?

A heap-based out-of-bounds write vulnerability affects Foxit PDF Editor and Reader, specifically in the rendering of Circle annotations with malformed Cloudy appearance streams in crafted PDF files. This flaw arises from inadequate validation of appearance geometry, potentially leading to memory corruption and crashes of the application. Users may experience significant disruptions unless addressed through updates or patches provided by the vendor.

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

Xupeng
.