What’s Vulnerable › Vulnerabilities

CVE-2023-40031: Notepad++ vulnerable to heap buffer write overflow in Utf8_16_Read::convert

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-08-25 · updated 2026-06-17
• Weakness: CWE-120

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++.

Affected products

• Notepad++: through 8.5.6

References

• https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/
• https://securitylab.github.com/advisories/GHSL-2023-092_Notepad__/

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