CVE-2026-91805 Use-after-free Vulnerability in Foxit PDF Editor/Reader Page-tree Handling

What is CVE-2026-91805?

CVE-2026-91805 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 PDF page-tree handling. A specially crafted PDF can trigger page-structure changes during rendering, causing the application to access released page objects and resulting in memory corruption and an application crash.

Weakness: CWE-416

Which versions are affected by CVE-2026-91805?

It affects 2 products.

Products include Foxit Pdf Editor, Foxit Pdf Reader.

How do I fix CVE-2026-91805?

No fix has been published for CVE-2026-91805 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-2026-91805 being exploited?

There is no known exploitation of CVE-2026-91805 in the wild and no public exploit code.

Other vulnerabilities in Foxit Pdf Editor

• CVE-2022-28104 File upload in n/a Critical 9.8
• CVE-2022-24954 Memory corruption in n/a Critical 9.8
• CVE-2022-24955 Other in n/a Critical 9.8
• CVE-2026-91798 Foxit PDF Editor/Reader Updater Privilege Escalation High 8.8
• CVE-2026-91800 Foxit PDF Editor installer local privilege escalation High 8.8

All Foxit Pdf Editor vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-w77c-2xq3-h9h8.