CVE-2026-5942: Foxit PDF Editor/Reader AcroForm Signature Use-After-Free Vulnerability

Severity: medium (CVSS 5.5 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

Flaws in page lifecycle management allow document structure changes to desynchronize internal component states, causing subsequent operations to access invalidated objects and crash the program.

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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