Heap-Based Out-of-Bounds Read Vulnerability in Foxit PDF Editor/Reader
CVE-2026-91817

6.1MEDIUM

Key Information:

Vendor

Foxit Inc.

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

What is CVE-2026-91817?

A heap-based out-of-bounds read vulnerability exists in Foxit PDF Editor and Reader, specifically in the handling of wide strings within embedded PDF JavaScript. The flaw arises from inadequate validation of string-deletion ranges, possibly leading to an integer underflow. This can result in out-of-bounds read conditions, inducing an application crash and potentially exposing sensitive data.

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:
6.1
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
Low
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
.