CVE-2026-3778: Stack exhaustion caused by cyclic references in Foxit PDF Editor/Reader

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-01 · updated 2026-06-17
Weakness: CWE-674

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.

Affected products

Foxit PDF Reader: through 13.2.2.24014; from 14.0.0.33046 through 14.0.2.33402; from 2023.1.0.15510 through 2023.3.0.23028; from 2024.1.0.23997 through 2024.4.1.27687; from 2025.1.0.27937 through 2025.3.0.35737; through 13.2.2.63349
Foxit Pdf Reader: through 2025.3.0.35737; through 2025.3.0.69570

References

https://www.foxit.com/support/security-bulletins.html

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