Is CVE-2026-91804 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91804 being exploited in the wild.

How severe is CVE-2026-91804?

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 earlier 2026.x; 2025.3.0.35737 and earlier 2025.x; 2024.4.1.27687 and earlier 2024.x; 2023.3.0.23028 and earlier 2023.x; 14.0.7.33751 and earlier 14.x; 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.

Is there a fix for CVE-2026-91804?

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

How is CVE-2026-91804 attacked?

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

Am I affected by CVE-2026-91804?

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-2026-91804: Foxit PDF Editor and Reader heap overflow in Circle annotation rendering

CVE-2026-91804 · Severity: high · CVSS 7.8 · Published 2026-09-23

Foxit PDF Editor and Reader are widely used applications for creating, editing, and viewing PDF documents in business and personal workflows. A flaw in how these products render Circle annotations in specially crafted PDF files can cause memory corruption and application crashes, potentially leading to code execution if an attacker crafts a malicious PDF and tricks a user into opening it.

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

Quick answers

Is CVE-2026-91804 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91804 being exploited in the wild.
How severe is CVE-2026-91804?: 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 earlier 2026.x; 2025.3.0.35737 and earlier 2025.x; 2024.4.1.27687 and earlier 2024.x; 2023.3.0.23028 and earlier 2023.x; 14.0.7.33751 and earlier 14.x; 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.
Is there a fix for CVE-2026-91804?: A patch was published on 2026-09-23: Fixed in Foxit PDF Reader 2026.2.1 and Foxit PDF Editor 2026.2.1/14.0.8 and later Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-91804 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-91804?: 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 rendering of Circle annotations with malformed Cloudy appearance streams, stemming from insufficient validation of appearance geometry. The vulnerability is triggered when a user opens a specially crafted PDF file, requiring no authentication or special privileges; successful exploitation can result in memory corruption, application crash, or arbitrary code execution with the privileges of the user.

Affected products

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

Timeline

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

References

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

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