Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.7
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-
- https://github.com/notepad-plus-plus/wingup/commit/7670296a5c7fdec624e0a45dbde51
- https://github.com/notepad-plus-plus/wingup/pull/106
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-
FAQ
What is CVE-2026-57233?
CVE-2026-57233 is a vulnerability with a CVSS score of 8.1 (HIGH). 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...
How severe is CVE-2026-57233?
CVE-2026-57233 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-57233?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.