---
title: "CVE-2026-91811: Foxit PDF Editor/Reader - Out of Bounds Write"
description: "Foxit PDF Editor/Reader contains a buffer overflow caused by insufficient validation of vertex indices in triangular fan texture meshes in the PRC parser, letting attackers cause memory corruption and application crash, exploit requires crafted malicious file."
url: https://panop.io/threat-heartbeat/CVE-2026-91811/
---

# CVE-2026-91811 Foxit PDF Editor/Reader - Out of Bounds Write

Foxit PDF Editor/Reader contains a buffer overflow caused by insufficient validation of vertex indices in triangular fan texture meshes in the PRC parser, letting attackers cause memory corruption and application crash, exploit requires crafted malicious file.

CVSS base score 7.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-91811)

## Details

Type

Out of Bounds Write

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-787](https://cwe.mitre.org/data/definitions/787.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-2026-91811](https://nvd.nist.gov/vuln/detail/CVE-2026-91811)
- [https://www.foxit.com/support/security-bulletins.html](https://www.foxit.com/support/security-bulletins.html)

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## 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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