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Vulnerability record · CVE-2023-40031 · published 25 August 2023

CVE-2023-40031: Notepad-plus-plus notepad\+\+ classic buffer overflow vulnerability

Notepad Plus Plus · Notepad\+\+

Notepad++ is a free and open-source source code editor. Versions 8.5.6 and prior are vulnerable to heap buffer write overflow in `Utf8_16_Read::convert`. This issue may lead to arbitrary code execution. As of time of publication, no known patches are available in existing versions of Notepad++.

7.8 CVSS 3.1 High EPSS 0.52% · top 58.3% CWE-120 · Classic buffer overflowCWE-122 · Heap-based buffer overflow
7.8CVSS 3.1 base score
0.52%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Notepad++ is a free and open-source source code editor. Versions 8.5.6 and prior are vulnerable to heap buffer write overflow in `Utf8_16_Read::convert`. This issue may lead to arbitrary code execution. As of time of publication, no known patches are available in existing versions of Notepad++.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/ ExploitThird Party Advisory
https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/ ExploitThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-40031), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.