Vulnerability Description
Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDATA_FULL_CMDLINE path. The handler appears to process COPYDATASTRUCT.lpData as an unbounded NUL-terminated wchar_t* instead of enforcing COPYDATASTRUCT.cbData. This vulnerability is fixed in 8.9.6.1.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Notepad-Plus-Plus | Notepad\+\+ | < 8.9.6.1 |
Related Weaknesses (CWE)
References
- https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a3Patch
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-ExploitPatchVendor Advisory
- https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-ExploitPatchVendor Advisory
FAQ
What is CVE-2026-48770?
CVE-2026-48770 is a vulnerability with a CVSS score of 5.0 (MEDIUM). Notepad++ is a free and open-source source code editor. Prior to 8.9.6.1, a local process in the same interactive Windows session can send a malformed WM_COPYDATA message to Notepad++ using the COPYDA...
How severe is CVE-2026-48770?
CVE-2026-48770 has been rated MEDIUM with a CVSS base score of 5.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48770?
Check the references section above for vendor advisories and patch information. Affected products include: Notepad-Plus-Plus Notepad\+\+.