Is CVE-2026-91815 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-91815 being exploited in the wild.

How severe is CVE-2026-91815?

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-2026-91815?

A patch was published on 2026-09-23: Fixed in PDF Reader 2026.2.1 and 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-2026-91815 attacked?

It is attacked with local access.

Am I affected by CVE-2026-91815?

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-2026-91815: Foxit PDF Editor/Reader out-of-bounds write in JPEG2000 decoding

CVE-2026-91815 · Severity: high · CVSS 7.8 · Published 2026-09-23

Foxit PDF Editor and Reader fail to properly validate JPEG2000 image metadata when processing PDF files, allowing an attacker to craft a malicious PDF that triggers a heap buffer overflow during image decoding. This can crash the application or potentially allow arbitrary code execution if the user opens the malicious PDF.

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

Quick answers

Is CVE-2026-91815 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-91815 being exploited in the wild.
How severe is CVE-2026-91815?: 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-2026-91815?: A patch was published on 2026-09-23: Fixed in PDF Reader 2026.2.1 and 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-2026-91815 attacked?: It is attacked with local access.
Am I affected by CVE-2026-91815?: 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

The vulnerability is an out-of-bounds write (CWE-787) in the JPEG2000 image decoder, caused by insufficient validation of image metadata before heap buffer operations. The attack vector is local and requires user interaction (opening a malicious PDF). An attacker can achieve code execution or denial of service via a specially crafted PDF file.

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: Security bulletin released by Foxit with fixes in PDF Reader 2026.2.1 and PDF Editor 2026.2.1/14.0.8
2026-09-23: patched: Fixed in PDF Reader 2026.2.1 and PDF Editor 2026.2.1/14.0.8

References

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

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