CVE-2026-6539— Notepad++ 8.9.3 Format String Injection via nativeLang.xml
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I. Basic Information for CVE-2026-6539
Vulnerability Information
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Vulnerability Title
Notepad++ 8.9.3 Format String Injection via nativeLang.xml
Source: NVD (National Vulnerability Database)
Vulnerability Description
Notepad++ 8.9.3 contains a format string injection vulnerability in the Find Results panel handler that allows attackers to cause denial of service and information disclosure by crafting a malicious nativeLang.xml language pack file. Attackers can distribute a poisoned language pack through community channels that triggers format string interpretation when a user performs search operations, leading to access violations and potential leakage of stack or register contents.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用外部控制的格式字符串
Source: NVD (National Vulnerability Database)
Vulnerability Title
Notepad++ 格式化字符串错误漏洞
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++ 8.9.3版本存在格式化字符串错误漏洞，该漏洞源于Find Results面板处理程序中存在格式字符串注入，可能导致拒绝服务和信息泄露。
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
II. Public POCs for CVE-2026-6539
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IV. Related Vulnerabilities
Same vendor: Notepad++
Same weakness: CWE-134
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