CVE-2026-5941: Foxit PDF Editor/Reader AcroForm Signature Remote Code Execution Vulnerability

Severity: high (CVSS 7.1 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-20

Description

Parsing logic flaws cause non-signature data to be misidentified as valid signatures when processing malformed form field hierarchies, leading to invalid memory writes and program crashes during internal data structure construction.

Affected products

Foxit PDF Reader: from 14.0.0 before 14.0.4; from 2023.0.0 before 2026.1.1 — fixed in 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 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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