Vulnerability Description
Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPM_SAVESESSION handler in PowerEditor/src/NppBigSwitch.cpp converts lParam to a sessionInfo pointer and dereferences its nbFile, files, and sessionFilePathName members without checking for null. A process running at the same or a higher Windows integrity level on the same desktop can send NPPM_SAVESESSION with a null lParam, immediately terminating Notepad++ and causing denial of service and loss of unsaved documents. This issue is fixed in version 8.9.8.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/8b33f52e7aa488b122
- https://github.com/notepad-plus-plus/notepad-plus-plus/releases/tag/v8.9.8
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-
- https://notepad-plus-plus.org/news/v898-released
FAQ
What is CVE-2026-86056?
CVE-2026-86056 is a vulnerability with a CVSS score of 5.5 (MEDIUM). Notepad++ is a free and open-source source code editor. Prior to 8.9.8, the NPPM_SAVESESSION handler in PowerEditor/src/NppBigSwitch.cpp converts lParam to a sessionInfo pointer and dereferences its n...
How severe is CVE-2026-86056?
CVE-2026-86056 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-86056?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.