CVE-2026-91791
Received Received - Intake

Foxit PDF Editor JavaScript Reentrancy Memory Corruption

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: Foxit

Description
When processing a specially crafted PDF file, Foxit PDF Editor/Reader may encounter a reentrant execution condition involving JavaScript triggered by page-visibility events. This can cause the application to access a released page-view object while calculating annotation boundaries, resulting in an invalid memory read and application crash.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-91791
EUVD
EUVD-2026-85131

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability occurs when Foxit PDF Editor or Reader processes a specially crafted PDF file. It involves JavaScript triggered by page-visibility events, leading to a reentrant execution condition. This can cause the application to access a released page-view object while calculating annotation boundaries, resulting in an invalid memory read and application crash.

Detection Guidance

This vulnerability involves a memory corruption issue triggered by specially crafted PDF files with JavaScript. Detection requires inspecting PDF files for suspicious JavaScript or page-visibility event handlers. Use tools like pdfinfo, pdftotext, or custom scripts to analyze PDF structure and JavaScript content. Monitor application crashes when opening PDFs as a potential indicator.

Impact Analysis

If exploited, this vulnerability could allow an attacker to crash the application or potentially execute arbitrary code on your system. This may lead to denial of service or unauthorized access to sensitive data, depending on the attacker's goals and system permissions.

Compliance Impact

This vulnerability may lead to application crashes when processing malicious PDFs, potentially causing denial of service or data corruption. While not directly impacting GDPR or HIPAA compliance, such crashes could disrupt access to sensitive data, potentially violating availability requirements under these regulations.

Mitigation Strategies

Update Foxit PDF Editor or Reader to the latest version to patch the vulnerability. Avoid opening untrusted PDF files, especially those from unknown sources. Disable JavaScript in Foxit PDF Reader/Editor if not required for functionality.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-91791. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart