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

Quick assessment

Affected
notepad-plus-plus notepad-plus-plus
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Notepad++是中国台湾侯今吾（Don Ho）个人开发者的一款开源的纯文本编辑器。 Notepad++ 存在安全漏洞，该漏洞源于在Utf8_16_Read::convert函数中存在堆缓冲区写入溢出漏洞。

CVSS 7.8 · High EPSS 0.52% · P42
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I. Basic Information for CVE-2023-40031

Vulnerability Information
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Vulnerability Title
Notepad++ vulnerable to heap buffer write overflow in Utf8_16_Read::convert
Source: CVE Program / CVE List V5
Vulnerability 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++.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未进行输入大小检查的缓冲区拷贝(传统缓冲区溢出)
Source: CVE Program / CVE List V5
Vulnerability Title
Notepad++ 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Notepad++是中国台湾侯今吾（Don Ho）个人开发者的一款开源的纯文本编辑器。 Notepad++ 存在安全漏洞，该漏洞源于在Utf8_16_Read::convert函数中存在堆缓冲区写入溢出漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
notepad-plus-plus notepad-plus-plus <= 8.5.6 -

II. Public POCs for CVE-2023-40031

# POC Description Source Link Shenlong Link
1 notepad++堆缓冲区溢出漏洞CVE-2023-40031 分析与复现 https://github.com/webraybtl/CVE-2023-40031 POC Details
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III. Intelligence Information for CVE-2023-40031

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Other References for CVE-2023-40031 (1)

Same Patch Batch · notepad-plus-plus · 2023-08-25 · 4 CVEs total

CVE-2023-40166 5.5 MEDIUM Notepad++ heap buffer read overflow in FileManager::detectLanguageFromTextBegining
CVE-2023-40164 5.5 MEDIUM Notepad++ global buffer read overflow in nsCodingStateMachine::NextState
CVE-2023-40036 5.5 MEDIUM Notepad++ global buffer read overflow in CharDistributionAnalysis::HandleOneChar

IV. Related Vulnerabilities

Same product: notepad-plus-plus
Same vendor: notepad-plus-plus
Same weakness: CWE-120

V. Comments for CVE-2023-40031

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