Is CVE-2026-91816 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91816 being exploited in the wild.

How severe is CVE-2026-91816?

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-2026-91816?

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 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-91816 attacked?

It is attacked with local access.

Am I affected by CVE-2026-91816?

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-2026-91816: Foxit PDF Editor use-after-free in annotation handling

CVE-2026-91816 · Severity: high · CVSS 7.8 · Published 2026-09-23

Foxit PDF Editor and Reader contain a use-after-free vulnerability in how they handle PDF annotations when JavaScript code attempts to delete them. An attacker can craft a malicious PDF that triggers this flaw when opened, causing the application to crash or potentially allowing code execution. This affects both the popular free Reader and the professional Editor product used by organizations handling sensitive documents.

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

Quick answers

Is CVE-2026-91816 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91816 being exploited in the wild.
How severe is CVE-2026-91816?: 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-2026-91816?: 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 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-91816 attacked?: It is attacked with local access.
Am I affected by CVE-2026-91816?: 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 the annotation deletion logic, triggered by reentrant JavaScript calls that attempt to delete annotation objects. When JavaScript code deletes an annotation during processing, the application may continue to access the freed annotation object, leading to memory corruption. The attack requires user interaction (opening a crafted PDF) and no authentication.

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: Vulnerability disclosed and patched versions released
2026-09-23: patched: Fixed in 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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