CVE-2026-3777 Use after free of view cache in Foxit PDF Editor/Reader
Crafted JavaScript in a PDF can trigger a use-after-free in the view cache, potentially allowing arbitrary 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-2026-3777?
CVE-2026-3777 is a medium-severity use after free vulnerability in Foxit Pdf Editor, published on 1 Apr 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
The application does not properly validate the lifetime and validity of internal view cache pointers after JavaScript changes the document zoom and page state. When a script modifies the zoom property and then triggers a page change, the original view object may be destroyed while stale pointers are still kept and later dereferenced, which under crafted JavaScript and document structures can lead to a use-after-free condition and potentially allow arbitrary code execution.
Weakness: CWE-416
Which versions are affected by CVE-2026-3777?
It affects 2 products.
Products include Foxit Pdf Editor, Foxit Pdf Reader.
How do I fix CVE-2026-3777?
No fix has been published for CVE-2026-3777 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-3777 being exploited?
There is no known exploitation of CVE-2026-3777 in the wild and no public exploit code.
Other vulnerabilities in Foxit Pdf Editor
Sources
Also known as GHSA-6xgc-8m9r-qvgm.