Medium severity5.0NVD Advisory· Published Jun 26, 2026· Updated Jun 29, 2026
CVE-2026-48770
CVE-2026-48770
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.
Affected products
2- cpe:2.3:a:notepad-plus-plus:notepad\+\+:*:*:*:*:*:*:*:*Range: <8.9.6.1
Patches
Vulnerability mechanics
References
2- github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797dnvdPatch
- github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2nvdExploitPatchVendor AdvisoryMitigation
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