CVE-2026-91804 Foxit PDF Editor/Reader Out-of-bounds Write Vulnerability While Rendering
Attackers can cause memory corruption and crashes via crafted PDFs, potentially leading to code execution in Foxit PDF Editor and Reader.
- 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-2026-91804?
CVE-2026-91804 is a high-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 write vulnerability exists in Foxit PDF Editor/Reader’s rendering of Circle annotations with malformed Cloudy appearance streams in specially crafted PDF files. Insufficient validation of the appearance geometry can result in memory corruption and application crashes.
Weakness: CWE-787
Which versions are affected by CVE-2026-91804?
It affects 2 products.
Products include Foxit Pdf Editor, Foxit Pdf Reader.
How do I fix CVE-2026-91804?
No fix has been published for CVE-2026-91804 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-2026-91804 being exploited?
There is no known exploitation of CVE-2026-91804 in the wild and no public exploit code.
Other vulnerabilities in Foxit Pdf Editor
Sources
Also known as GHSA-9vcg-w84f-mxjf.