CVE-2026-48770
Notepad++ 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.
INFO
Published Date :
June 26, 2026, 8:22 p.m.
Last Modified :
June 26, 2026, 8:22 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-48770
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update Notepad++ to version 8.9.6.1.
- Ensure all instances are updated.
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CVE-2026-48770 vulnerability anywhere in the article.