CVE-2026-91818

Analyzed Analyzed - Analysis Complete

Use-After-Free in Foxit PDF Editor/Reader via JavaScript Annotation Handling

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 JavaScript handling of PDF annotations. Reentrant page-event processing during annotation enumeration may release the associated page object, which is subsequently accessed, resulting in an application crash.

CVSS Scores

EPSS Scores

Probability:
Percentile:

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-2026-91818

EUVD

EUVD-2026-85156

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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's JavaScript handling of PDF annotations. It occurs when reentrant page-event processing during annotation enumeration releases the associated page object, which is then accessed again, causing an application crash.

Detection Guidance

This vulnerability cannot be directly detected via network or system commands as it involves a use-after-free flaw in Foxit's JavaScript handling of PDF annotations. Detection relies on updating Foxit software to patched versions and monitoring for crashes or unusual behavior when handling PDFs with annotations.

Impact Analysis

This vulnerability could allow an attacker to crash the application, potentially leading to denial of service. If exploited, it might also enable arbitrary code execution, posing risks to data integrity and confidentiality on affected systems.

Compliance Impact

This vulnerability could potentially impact compliance with GDPR and HIPAA by allowing application crashes through malicious PDFs, which may lead to denial of service or unauthorized access if exploited. However, specific compliance impacts depend on system configuration and usage context.

Mitigation Strategies

Update Foxit PDF Editor or Reader to the latest version to patch the use-after-free vulnerability in JavaScript handling of PDF annotations.

Hi! I’m here to help you understand CVE-2026-91818. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70