5.0Medium
CVE-2026-48770Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash
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.
Weakness (CWE):
CWE-125
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| notepad-plus-plus | notepad-plus-plus | < 8.9.6.1 | |
| notepad-plus-plus | notepad++ | < 8.9.6.1 |
References and patches
CPE matches (NVD) (1)
cpe:2.3:a:notepad-plus-plus:notepad\+\+:*:*:*:*:*:*:*:*< 8.9.6.1