CVE-2023-40031

Name: CVE-2023-40031
Creator: NVD / NIST
Published: 2023-08-25T20:15:08.517+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.49%

Last modified Jun 17, 2026

CVE-2023-40031 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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`. EPSS estimates a 0.49% chance of exploitation in the next 30 days.

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++.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.49%

38.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Notepad-Plus-Plus	Notepad\+\+	<= 8.5.6

References

https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/Exploit, Third Party Advisory
https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/Exploit, Third Party Advisory

Timeline

Published: Aug 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-40031?

How severe is CVE-2023-40031?

CVE-2023-40031 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.49% probability of exploitation in the next 30 days.

How do I fix CVE-2023-40031?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-40031?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST