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CVE-2026-48770

MediumPublished

Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash

Published: Jun 26, 2026
Updated: Jun 29, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

5.0/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.1%

Low · next 30 days

Percentile: 3.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

Notepad-8.9.6-PoCPoC
Proof-of-concept scripts for three vulnerabilities in Notepad++ <= 8.9.6, patched in v8.9.6.1 (2026-05-26) CVE-2026-48770 / CVE-2026-48778 / CVE-2026-48800

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