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.

Severity (CVSS)

Base score5
SeverityMedium
VersionCVSS 3.1
VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Provided byCNA

Weaknesses

  • CWE-125 — CWE-125: Out-of-bounds Read

Affected products

VendorProductVersions
notepad-plus-plusnotepad-plus-plus< 8.9.6.1

References

Authoritative sources

This page is a snapshot. For the latest enrichment and updates, view the record on CVE.org or the NVD.

Generated from the official CVE List on 27 Jun 2026 07:02 UTC.