What’s Vulnerable › Vulnerabilities

CVE-2020-26534

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-10-02 · updated 2026-06-17
• Weakness: CWE-416

Description

An issue was discovered in Foxit Reader and PhantomPDF before 10.1. There is an Opt object use-after-free related to Field::ClearItems and Field::DeleteOptions, during AcroForm JavaScript execution.

Affected products

• Foxit Reader: before 10.1 — fixed in 10.1
• Foxit PhantomPDF: before 10.1 — fixed in 10.1

How to fix

Upgrade to a fixed version: Foxit Reader 10.1; Foxit PhantomPDF 10.1. Check the vendor advisory for mitigations.

References

• https://www.foxitsoftware.com/support/security-bulletins.html
• https://www.foxitsoftware.com/support/security-bulletins.html

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