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CVE-2026-5937: Foxit PDF Editor/Reader's insufficient parameter validation leads to denial-of-service vulnerability

• 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: 2026-04-27 · updated 2026-10-26
• Weakness: CWE-248

Description

Insufficient parameter verification leads to the occurrence of format errors in files, which will trigger an unhandled "std::invalid_argument" exception, ultimately causing the program to terminate.

Affected products

• Foxit PDF Reader: before 13.2.4; from 14.0.0 before 14.0.4; from 2023.0.0 before 2026.1.1 — fixed in 13.2.4, 14.0.4, 2026.1.1
• Foxit Pdf Reader: before 2026.1.1 — fixed in 2026.1.1

How to fix

Upgrade to a fixed version: Foxit PDF Reader 13.2.4, 14.0.4, 2026.1.1; Foxit Pdf Reader 2026.1.1. Check the vendor advisory for mitigations.

References

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

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