Is CVE-2026-91811 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91811 being exploited in the wild.

How severe is CVE-2026-91811?

High severity, with a CVSS score of 7.8, published 23 September 2026.

Which products and versions are affected?

Foxit PDF Editor 2026.2.0.39747 and all previous 2026.x versions, 2025.3.0.35737 and all previous 2025.x versions, 2024.4.1.27687 and all previous 2024.x versions, 2023.3.0.23028 and all previous 2023.x versions, 14.0.7.33751 and all previous 14.x versions, 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.

Is there a fix for CVE-2026-91811?

A patch was published on 2026-09-23: Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-91811 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-91811?

Check whether you run Foxit PDF Editor or Foxit PDF Reader at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-91811: Foxit PDF Reader heap out-of-bounds write in PRC parser

CVE-2026-91811 · Severity: high · CVSS 7.8 · Published 2026-09-23

Foxit PDF Reader and Editor are desktop applications used to view and edit PDF documents. A flaw in how these products parse PRC (Product Representation Compact) 3D model files can cause a crash or potentially allow an attacker to execute code by crafting a malicious PDF or 3D model file. An attacker would need to trick a user into opening a specially crafted file.

Technologies: Foxit PDF Editor, Foxit PDF Reader. Vendors: Foxit.

Quick answers

Is CVE-2026-91811 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91811 being exploited in the wild.
How severe is CVE-2026-91811?: High severity, with a CVSS score of 7.8, published 23 September 2026.
Which products and versions are affected?: Foxit PDF Editor 2026.2.0.39747 and all previous 2026.x versions, 2025.3.0.35737 and all previous 2025.x versions, 2024.4.1.27687 and all previous 2024.x versions, 2023.3.0.23028 and all previous 2023.x versions, 14.0.7.33751 and all previous 14.x versions, 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.
Is there a fix for CVE-2026-91811?: A patch was published on 2026-09-23: Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-91811 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-91811?: Check whether you run Foxit PDF Editor or Foxit PDF Reader at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A heap-based out-of-bounds write vulnerability exists in the PRC parser due to insufficient validation of vertex indices in triangular fan texture meshes (CWE-787). The flaw is triggered when processing malformed PRC data embedded in PDF files or 3D content. Exploitation requires user interaction to open a crafted file and can result in memory corruption, denial of service, or code execution.

Affected products

Foxit PDF Reader 2026.2.0.39747 and earlier
Foxit PDF Editor 2026.2.0.39747 and all previous 2026.x versions, 2025.3.0.35737 and all previous 2025.x versions, 2024.4.1.27687 and all previous 2024.x versions, 2023.3.0.23028 and all previous 2023.x versions, 14.0.7.33751 and all previous 14.x versions, 13.2.6.24111 and earlier

Timeline

2026-09-23: disclosed
2026-09-23: patched: Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8

References

https://www.foxit.com/support/security-bulletins.html

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