CVE-2026-91791

Foxit PDF Editor/Reader Annotation Use-After-Free Remote Code Execution Vulnerability

Published Sep 23, 2026 CVSS 3.1 · 7.8 High EPSS < 1% KEV · Not listed
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.

Analysis

AI-generated

Technical impact

Foxit PDF Editor/Reader may process a specially crafted PDF that triggers JavaScript during page‑visibility events. This can cause the application to enter a re‑entrant path while a page‑view object has already been freed, resulting in an invalid memory read and a crash. The CVE description does not provide evidence of arbitrary code execution, so the impact is limited to denial of service.

Affected Systems

Foxit Software Inc. products: Foxit PDF Editor and Foxit PDF Reader. No specific vulnerable versions are listed, so any build prior to the latest vendor release may be affected.

Risk and Exploitability

The CVSS score of 7.8 marks the vulnerability as high severity, while the EPSS score of less than 1% indicates a low likelihood of exploitation currently. The issue is not present in CISA’s KEV catalog. Exploitation would require the victim to open a malicious PDF, typically via email or a web download, which is a user‑initiated but remotely deliverable vector. This estimation is inferred from the description, as the threat requires user interaction.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade Foxit PDF Editor and Reader to the latest version available from Foxit Software to apply the vendor‑issued fix.
  • Disable JavaScript execution within PDF documents, or enforce a policy that blocks embedded scripts to prevent re‑entrant processing.
  • Restrict or quarantine PDFs from untrusted sources, and enforce email/download controls to limit the opportunity for malicious documents to reach users.

Generated by OpenCVE AI on September 23, 2026 at 16:39 UTC.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Foxit
Foxit pdf Editor
Foxit pdf Reader
Microsoft
Microsoft windows
CPEs cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*
cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*
Vendors & Products Foxit
Foxit pdf Editor
Foxit pdf Reader
Microsoft
Microsoft windows
Type Values Removed Values Added
First Time appeared Foxitsoftware
Foxitsoftware foxit Pdf Editor
Foxitsoftware foxit Reader
Vendors & Products Foxitsoftware
Foxitsoftware foxit Pdf Editor
Foxitsoftware foxit Reader
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Foxit PDF Editor/Reader Annotation Use-After-Free Remote Code Execution Vulnerability
Weaknesses CWE-416
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Foxit
Published
Updated
Sep 23, 2026, 2:47 PM
Reserved
Sep 15, 2026, 7:34 AM
Status
Analyzed
Published
Sep 23, 2026, 8:17 AM
Modified
Oct 8, 2026, 12:52 PM