CVE-2026-57233 Notepad++: Path Traversal (Zip Slip) in WinGup Plugin Extraction
Attackers can overwrite plugin DLLs via Zip Slip in WinGup, leading to arbitrary code execution when Notepad++ loads the modified plugin.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-57233?
CVE-2026-57233 is a high-severity path traversal vulnerability in notepad-plus-plus, published on 17 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2026-57233?
How do I fix CVE-2026-57233?
No fix has been published for CVE-2026-57233 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-57233 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-57233 exists.
Sources
Also known as GHSA-hjxw-84rf-wg5r.