CVE-2026-3778 Stack exhaustion caused by cyclic references in Foxit PDF Editor/Reader
Attackers can crash Foxit PDF Editor or Reader by crafting PDFs with cyclic references that trigger stack exhaustion during deep traversal.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-3778?
CVE-2026-3778 is a medium-severity denial of service vulnerability in Foxit Pdf Editor, published on 1 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The application does not detect or guard against cyclic PDF object references while handling JavaScript in PDF. When pages and annotations are crafted that reference each other in a loop, passing the document to APIs (e.g., SOAP) that perform deep traversal can cause uncontrolled recursion, stack exhaustion, and application crashes.
Weakness: CWE-674
Which versions are affected by CVE-2026-3778?
It affects 2 products.
Products include Foxit Pdf Editor, Foxit Pdf Reader.
How do I fix CVE-2026-3778?
No fix has been published for CVE-2026-3778 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-3778 being exploited?
There is no known exploitation of CVE-2026-3778 in the wild and no public exploit code.
Other vulnerabilities in Foxit Pdf Editor
Sources
Also known as GHSA-hfjq-v5wc-856q.