CVE-2026-48770

Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash

Published Jun 26, 2026 CVSS 3.1 · 5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Notepad-plus-plus
Notepad-plus-plus notepad++
Vendors & Products Notepad-plus-plus
Notepad-plus-plus notepad++
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash
Weaknesses CWE-125
References
Metrics cvssV3_1

{'score': 5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jun 29, 2026, 12:11 PM
Reserved
May 22, 2026, 7:39 PM
Status
Analyzed
Published
Jun 26, 2026, 9:16 PM
Modified
Jun 29, 2026, 9:21 PM