CVE-2026-48770

FAUCET Score

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.

First published: Jun 26, 2026Last modified: Jun 26, 2026

Impacted Technologies

Vendor	Product	Version(s)	CPE
		< 8.9.6.1CPE matchmatch criteria	cpe:2.3:a:notepad-plus-plus:notepad\+\+::::::::

CVSS Data

CVSS version used by this source: 3.1

5.0MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

Exploitability Score

1.3

Impact Score

3.6

CvssVersion

3.1

Exploit Intelligence

EPSS Score

0.26%

Probability of exploitation in next 30 days

EPSS Percentile

17.5%

Percentile rank of EPSS score among Peer Group

As of 2026-07-25

Model: v2026.06.15

This CVE's current EPSS score of 0.0026 is in the 58th percentile among its peer group of 381 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference

View patch

References

github.com / notepad-plus-plus/notepad-plus-plus/commit/f20a0888a92ce557a339b833cd9d9d8e97dc797d

Patch

github.com / notepad-plus-plus/notepad-plus-plus/security/advisories/GHSA-r39g-3mcw-xcg2

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