CVE-2008-3436: Notepad++

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

The GUP generic update process in Notepad++ before 4.8.1 does not properly verify the authenticity of updates, which allows man-in-the-middle attackers to execute arbitrary code via a Trojan horse update, as demonstrated by evilgrade and DNS cache poisoning.

Affected products

• Notepad++ Notepad++: up to and including 1.0; up to and including 1.1; up to and including 1.2; up to and including 1.3; up to and including 1.4; up to and including 1.5; …

Published 2008-08-01. Last modified 2026-06-16.