CVE-2026-48770: medium-severity vulnerability in notepad-plus-plus
Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash
Published · Updated
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 5epss 0.1%
from disclosure to weapon0 days
Published on NVDJun 26
1st PoCMay 28
exploitation probability
0.1%top 97% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Affected products
notepad-plus-plus · notepad-plus-pluspublic PoCs found — 1
githubgithub.com/atiilla/Notepad-8.9.6-PoC★ 6⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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