What’s Vulnerable › Vulnerabilities

CVE-2020-26535

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.7% 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-787

Description

An issue was discovered in Foxit Reader and PhantomPDF before 10.1. If TslAlloc attempts to allocate thread local storage but obtains an unacceptable index value, V8 throws an exception that leads to a write access violation (and read access violation).

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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