CVE-2026-91806

Analyzed Analyzed - Analysis Complete

Use-After-Free in Foxit PDF Editor/Reader via PDF Form Fields

Publication date: 2026-09-23

Last updated on: 2026-10-08

Assigner: Foxit

Description

A use-after-free vulnerability exists in Foxit PDF Editor/Reader’s handling of PDF form fields. Embedded JavaScript may access form-field references after the corresponding fields have been released, resulting in an application crash.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-23

Last Modified

2026-10-08

Generated

2026-10-13

AI Q&A

2026-09-23

EPSS Evaluated

2026-10-12

NVD

CVE-2026-91806

EUVD

EUVD-2026-85118

Affected Vendors & Products

Vendor	Product	Version / Range
foxit	pdf_editor	From 2023.1.0.15510 (inc) to 2023.3.0.23028 (inc)
foxit	pdf_editor	From 2024.1.0.23997 (inc) to 2024.4.1.27687 (inc)
foxit	pdf_editor	From 2025.1.0.27937 (inc) to 2025.3.0.35737 (inc)
foxit	pdf_editor	to 13.2.5.63482 (inc)
foxit	pdf_editor	From 14.0.0.33046 (inc) to 14.0.7.33751 (inc)
foxit	pdf_editor	From 2026.1.0.36452 (inc) to 2026.2.0.39747 (inc)
foxit	pdf_reader	to 2026.2.0.39747 (inc)

Helpful Resources

Exploitability

CWE

KEV

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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

Executive Summary

This vulnerability is a use-after-free issue in Foxit PDF Editor/Reader related to PDF form fields. It occurs when embedded JavaScript accesses form-field references after those fields have been released, causing the application to crash.

Detection Guidance

This vulnerability is specific to Foxit PDF Editor/Reader and requires checking the installed version of the software. Use the application's built-in update feature or check the version through the software's about section. Compare the version against the affected versions listed in the advisory.

Impact Analysis

This vulnerability could allow an attacker to crash the application or potentially execute arbitrary code if they trick a user into opening a specially crafted PDF file. This may lead to denial of service or unauthorized access to system resources.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by enabling unauthorized access to sensitive data through remote code execution or information disclosure. Exploitation may lead to data breaches, violating confidentiality requirements under these regulations.

Mitigation Strategies

Update Foxit PDF Editor or Reader to the latest version to patch the use-after-free vulnerability in PDF form fields handling.

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