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CVE-2026-48770— Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash

Quick assessment

Affected
notepad-plus-plus notepad-plus-plus
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

notepad-plus-plus notepad-plus-plus是notepad-plus-plus团队的一款文本编辑软件。 notepad-plus-plus 8.9.6.1之前版本存在缓冲区错误漏洞，该漏洞源于处理WM_COPYDATA消息时未正确限制COPYDATASTRUCT.lpData数据长度，可能导致同一交互式Windows会话中的本地进程发送恶意消息，造成拒绝服务。

CVSS 5.0 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
notepad-plus-plus notepad-plus-plus < 8.9.6.1 affected
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I. Basic Information for CVE-2026-48770

Vulnerability Information
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Vulnerability Title
Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
notepad-plus-plus 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
notepad-plus-plus notepad-plus-plus是notepad-plus-plus团队的一款文本编辑软件。 notepad-plus-plus 8.9.6.1之前版本存在缓冲区错误漏洞，该漏洞源于处理WM_COPYDATA消息时未正确限制COPYDATASTRUCT.lpData数据长度，可能导致同一交互式Windows会话中的本地进程发送恶意消息，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
notepad-plus-plus notepad-plus-plus < 8.9.6.1 -

II. Public POCs for CVE-2026-48770

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III. Intelligence Information for CVE-2026-48770

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Patches & Fixes for CVE-2026-48770 (1)

Vendor Advisories for CVE-2026-48770 (1)

Same Patch Batch · notepad-plus-plus · 2026-06-26 · 6 CVEs total

CVE-2026-52884 7.8 HIGH Notepad++: CVE-2026-48800 Bypass
CVE-2026-48778 7.8 HIGH Notepad++: Arbitrary Code Execution via config.xml commandLineInterpreter
CVE-2026-48800 7.8 HIGH Notepad++: Arbitrary Code Execution via shortcuts.xml UserCommand Injection
CVE-2026-52885 Notepad++ TOCTOU: HMAC Checks Disk, Executes from Memory
CVE-2026-46710 Notepad++: Privilege Escalation in the Installer via Uncontrolled Executable Search Path

IV. Related Vulnerabilities

Same product: notepad-plus-plus
Same vendor: notepad-plus-plus
Same weakness: CWE-125

V. Comments for CVE-2026-48770

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