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CVE-2026-48770

Notepad++ WM_COPYDATA COPYDATA_FULL_CMDLINE local DoS crash

Published: Jun 26, 2026Updated: Jun 29, 2026 Sources: CVE List NVD BDUCWE-125
5.0MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 82.6%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:RS:UC:NI:NA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-125

Affected Products

notepad-plus-plus
commercialaka notepad++, notepad+ plus, notepad plus plus
notepad\+\+On-prem
Consumer Software / productivity
notepad-plus-plusOn-prem
Consumer Software / productivity
Don Ho
commercial
Notepad++Mixed
Consumer Software / file-utility

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
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References

https://github.com/notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d
github.com
https://github.com/notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2
github.com
https://www.acn.gov.it/portale/w/notepad-poc-pubblici-per-le-cve-2026-48800-cve-2026-48778-e-cve-2026-48770
acn.gov.it
and 3 more references View all →
News mentions
1

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