Is CVE-2026-57233 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-57233?

CVE-2026-57233 has a CVSS v3 severity of HIGH (8.1).

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CVE-2026-57233

Description

Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the WinGup decompress function joins untrusted ZIP entry names to unzipDestTo without canonical containment validation, allowing an entry such as ../mimeTools/mimeTools.dll to overwrite a DLL in a sibling plugin directory and execute attacker-controlled code when Notepad++ next loads that plugin. This issue is fixed in version 8.9.7.