Out-of-bounds read in Notepad++ - CVE-2026-48770
Published: May 26, 2026
Vulnerability identifier: #VU132325
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-48770
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Notepad++
Affected software:
Notepad++
Notepad++
Detailed vulnerability description
The vulnerability allows a local process to cause a denial of service.
The vulnerability exists due to out-of-bounds read in the WM_COPYDATA COPYDATA_FULL_CMDLINE handler when processing a malformed WM_COPYDATA message. A local process can send a specially crafted IPC message to cause a denial of service.
User interaction is required to have Notepad++ open in the same interactive Windows session.
How to mitigate CVE-2026-48770
Install security update from vendor's website.