CVE-2026-5943: Foxit PDF Editor/Reader AcroForm Annotation Use-After-Free Remote Code Execution Vulnerability

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% 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-416

Description

Document structural anomalies caused inconsistencies between page element relationships and internal index states. When scripts triggered document modifications, object reference validity was not properly maintained, leading to a crash when accessing an invalid pointer during page information queries.

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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