CVE-2026-91790 Foxit PDF Editor/Reader Doc Object Use-After-Free Information Disclosure Vulnerability

High 7.8 Published 23 Sep 2026 Updated 23 Sep 2026

Attackers can trigger a use-after-free via malformed PDFs, causing crashes and potential information disclosure in Foxit PDF products.

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-2026-91790?

CVE-2026-91790 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

When rendering the page image, Foxit PDF Editor/Reader fails to perform validation on image objects whose optional content attributes are malformed. As a result, the program may access an already-freed internal data structure, triggering a crash due to UAF.

Weakness: CWE-416

Which versions are affected by CVE-2026-91790?

It affects 2 products.

Products include Foxit Pdf Editor, Foxit Pdf Reader.

How do I fix CVE-2026-91790?

No fix has been published for CVE-2026-91790 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-2026-91790 being exploited?

There is no known exploitation of CVE-2026-91790 in the wild and no public exploit code.

All Foxit Pdf Editor vulnerabilities

Sources

Also known as GHSA-2w63-pggx-6fp3.