---
title: "CVE-2026-91791: Foxit PDF Editor/Reader - Denial of Service"
description: "Foxit PDF Editor/Reader contains a use-after-free vulnerability caused by reentrant JavaScript execution triggered by page-visibility events, letting attackers cause application crash via invalid memory read, exploit requires crafted PDF file."
url: https://panop.io/threat-heartbeat/CVE-2026-91791/
---

# CVE-2026-91791 Foxit PDF Editor/Reader - Denial of Service

Foxit PDF Editor/Reader contains a use-after-free vulnerability caused by reentrant JavaScript execution triggered by page-visibility events, letting attackers cause application crash via invalid memory read, exploit requires crafted PDF file.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91791)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Published

23 September 2026

Updated

15 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to the latest version of Foxit PDF Editor/Reader.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-91791](https://nvd.nist.gov/vuln/detail/CVE-2026-91791)
- [https://www.foxit.com/support/security-bulletins.html](https://www.foxit.com/support/security-bulletins.html)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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