Is CVE-2026-91806 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91806 being exploited in the wild.

How severe is CVE-2026-91806?

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-2026-91806?

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-2026-91806 attacked?

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

Am I affected by CVE-2026-91806?

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-2026-91806: Foxit PDF Editor and Reader use-after-free in form field handling

CVE-2026-91806 · Severity: high · CVSS 7.8 · Published 2026-09-23

Foxit PDF Editor and Reader contain a use-after-free vulnerability in their PDF form field handling that can be triggered by embedded JavaScript code. An attacker can craft a malicious PDF that causes the application to crash when JavaScript accesses form field references that have already been released from memory. While this primarily causes application instability, it could potentially be leveraged for more severe attacks depending on the underlying memory conditions.

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

Quick answers

Is CVE-2026-91806 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91806 being exploited in the wild.
How severe is CVE-2026-91806?: 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-2026-91806?: 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-2026-91806 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-91806?: 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 Foxit PDF Editor and Reader's handling of PDF form fields, where embedded JavaScript may access form-field references after the corresponding fields have been released. The vulnerability is triggered through malicious PDF documents containing JavaScript that interact with form objects. An attacker must deliver a crafted PDF document and trick a user into opening it, resulting in application crash and potential information disclosure or code execution depending on memory layout.

Affected products

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

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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