---
id: CVE-2026-91817
title: >-
  A heap-based out-of-bounds read vulnerability exists in Foxit PDF
  Editor/Reader’s handling of wide strings in embedded PDF JavaScript
summary: >-
  A heap-based out-of-bounds read vulnerability exists in Foxit PDF
  Editor/Reader’s handling of wide strings in embedded PDF JavaScript.
  Insufficient validation of string-deletion ranges can cause an integer
  underflow, resulting in an out-…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: Foxit Software Inc.
product: Foxit PDF Editor
affected:
  - foxit_pdf_editor Versions 2026.2 and earlier
  - foxit_pdf_editor Versions 14.0.7 and earlier
  - foxit_pdf_editor Versions 13.2.6 and earlier
  - foxit_pdf_reader Versions 2026.2 and earlier
published: '2026-09-23'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:58:26.570'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91817'
references:
  - url: 'https://www.foxit.com/support/security-bulletins.html'
    label: 14984358-7092-470d-8f34-ade47a7658a2
tags:
  - nvd
  - cve.org
epss: 0.00153
epssPercentile: 0.048
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-23T14:22:00.125904Z'
ingestedAt: '2026-09-23T08:20:37.597Z'
---

## Overview

A heap-based out-of-bounds read vulnerability exists in Foxit PDF Editor/Reader’s handling of wide strings in embedded PDF JavaScript. Insufficient validation of string-deletion ranges can cause an integer underflow, resulting in an out-of-bounds read and application crash.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.