CVE-2026-48770

published 2026-06-26

CVE-2026-48770: 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…

Priority P4 19 medium 5 CVSS 3.1

AV L AC L PR L UI R S U C N I N A H

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.

Affected

2 ranges

Vendor	Product	Version range	Fixed in
notepad-plus-plus	notepad	< 8.9.6.1	8.9.6.1
notepad-plus-plus	notepad-plus-plus	< 8.9.6.1	8.9.6.1

Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.

CWE-125