Is CVE-2026-91799 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91799 being exploited in the wild.

How severe is CVE-2026-91799?

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

Is there a fix for CVE-2026-91799?

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

How is CVE-2026-91799 attacked?

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

Am I affected by CVE-2026-91799?

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-2026-91799: Foxit PDF Editor use-after-free in JavaScript array handling

CVE-2026-91799 · Severity: high · CVSS 7.8 · Published 2026-09-23

Foxit PDF Editor and Reader are widely-used document processing applications. A use-after-free vulnerability in how they handle JavaScript arrays in PDF files can allow attackers to trigger application crashes or potentially execute arbitrary code by crafting a malicious PDF. No active exploitation has been reported as of the disclosure date.

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

Quick answers

Is CVE-2026-91799 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91799 being exploited in the wild.
How severe is CVE-2026-91799?: 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, 2025.3.0.35737 and all previous 2025.x, 2024.4.1.27687 and all previous 2024.x, 2023.3.0.23028 and all previous 2023.x, 14.0.7.33751 and all previous 14.x, 13.2.6.24111 and earlier; Foxit PDF Reader 2026.2.0.39747 and earlier.
Is there a fix for CVE-2026-91799?: A patch was published on 2026-09-23: PDF Reader 2026.2.1 and PDF Editor 2026.2.1/14.0.8 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-91799 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-91799?: 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 use-after-free vulnerability exists in JavaScript array object processing where the application accesses a released object during array operations. The vulnerability is triggered by opening a specially crafted PDF file, requiring only user interaction (opening the file) with no special privileges. Successful exploitation can lead to code execution or application denial of service; patches are available in reader version 2026.2.1 and editor versions 2026.2.1/14.0.8 and later.

Affected products

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

Timeline

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

References

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

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