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CVE-2026-3779: Foxit PDF Editor/Reader List Box Calculate Array Use-After-Free Vulnerability

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-01 · updated 2026-06-17
• Weakness: CWE-416

Description

The application's list box calculate array logic keeps stale references to page or form objects after they are deleted or re-created, which allows crafted documents to trigger a use-after-free when the calculation runs and can potentially lead to arbitrary code execution.

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
• https://www.talosintelligence.com/vulnerability_reports/TALOS-2026-2365

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