CVE-2026-91817
Received Received - Intake

Heap-based Out-of-Bounds Read in Foxit PDF Editor/Reader

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: Foxit

Description
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.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-09-23
AI Q&A
2026-09-23
EPSS Evaluated
N/A
NVD
CVE-2026-91817
EUVD
EUVD-2026-85157

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
foxit pdf_editor *
foxit pdf_reader *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This is a heap-based out-of-bounds read vulnerability in Foxit PDF Editor/Reader. It occurs when handling wide strings in embedded PDF JavaScript. Insufficient validation of string-deletion ranges can cause an integer underflow, leading to an out-of-bounds read and application crash.

Impact Analysis

An attacker could exploit this to crash the application, potentially leading to denial of service. If exploited successfully, it might allow limited information disclosure or further system compromise depending on the context.

Mitigation Strategies

Update Foxit PDF Editor or Reader to the latest version to patch the vulnerability. Avoid opening untrusted PDF files with embedded JavaScript. Disable JavaScript in Foxit PDF Reader/Editor if not required.

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