Buffer overflow in Notepad++ - #VU151932
Published: September 24, 2026
Vulnerability identifier: #VU151932
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-120
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper bounds checking in the NPPM_GETCURRENTWORD, NPPM_GETCURRENTLINESTR, and NPPM_GETFILENAMEATCURSOR handlers when processing a selection of 2048 or more characters. A local user can send window messages that select text and invoke a context menu command to cause a denial of service.
Exploitation requires the attacking process to run in the same session at the same or higher integrity level as Notepad++.
Affected software
Notepad++
Remediation
Install security update from vendor's website.
Notepad++ - update to 8.9.8.1