Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash_CVE-2026-48770

5 / 10

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-48770

Source GitHub_M

Published Jun 26, 2026 at 20:22

Affected Product

Vendor notepad-plus-plus

Product notepad-plus-plus

Version < 8.9.6.1

Affected Versions notepad-plus-plus notepad-plus-plus < 8.9.6.1

CWE Classification

CWE-125

References

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    "published": "2026-06-26T20:22:17.683Z",
    "modified": "2026-06-26T20:22:17.683Z",
    "type": "cve",
    "title": "Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash",
    "source": "GitHub_M",
    "references": "https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2\nhttps://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d",
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