CVE-2026-91809 Foxit PDF Editor/Reader Annotation Use-After-Free Information Disclosure Vulnerability
A use-after-free in Foxit PDF Editor/Reader allows attackers to cause application crashes and potentially disclose information via malformed PDF form fields.
- 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-2026-91809?
CVE-2026-91809 is a high-severity use after free 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 use-after-free vulnerability exists in Foxit PDF Editor/Reader’s handling of malformed PDF form fields. Improper validation during field-name traversal may cause the application to access a released object, resulting in an application crash.
Weakness: CWE-416
Which versions are affected by CVE-2026-91809?
It affects 2 products.
Products include Foxit Pdf Editor, Foxit Pdf Reader.
How do I fix CVE-2026-91809?
No fix has been published for CVE-2026-91809 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-2026-91809 being exploited?
There is no known exploitation of CVE-2026-91809 in the wild and no public exploit code.
Other vulnerabilities in Foxit Pdf Editor
Sources
Also known as GHSA-j3h3-v4jq-6qgp.