CVE-2026-91817 Foxit PDF Editor/Reader AcroForm Out-of-Bounds Read Remote Code Execution Vulnerability
An attacker can trigger a heap-based out-of-bounds read via crafted PDF JavaScript, potentially leading to remote code execution or application crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-91817?
CVE-2026-91817 is a medium-severity memory corruption vulnerability in Foxit Pdf Editor, published on 23 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A heap-based out-of-bounds read vulnerability exists in Foxit PDF Editor/Reader’s handling of wide strings in embedded PDF JavaScript. Insufficient validation of string-deletion ranges can cause an integer underflow, resulting in an out-of-bounds read and application crash.
Weakness: CWE-125
Which versions are affected by CVE-2026-91817?
It affects 2 products.
Products include Foxit Pdf Editor, Foxit Pdf Reader.
How do I fix CVE-2026-91817?
No fix has been published for CVE-2026-91817 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-91817 being exploited?
There is no known exploitation of CVE-2026-91817 in the wild and no public exploit code.
Other vulnerabilities in Foxit Pdf Editor
Sources
Also known as GHSA-pg53-55p8-5cr6.