CVE-2026-57233
High
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.
SeverityHigh
CVSS8.1
Exploit probability—
ProductNotepad-plus-plus
PublishedAug 17, 2026
First seenAug 17, 2026
Weakness typeCWE-22Path traversal
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| notepad-plus-plus notepad-plus-plus | < 8.9.7 | — |
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