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CVE-2026-6539— Notepad++ 8.9.3 Format String Injection via nativeLang.xml

Quick assessment

Affected
Notepad++ Notepad++
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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++ 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。

CVSS 4.4 · Medium EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
Notepad++ Notepad++ < 8.9.4 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部控制的格式字符串
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Notepad++ Notepad++ 0 ~ 8.9.4 -

II. Public POCs for CVE-2026-6539

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III. Intelligence Information for CVE-2026-6539

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Vendor Advisories for CVE-2026-6539 (1)

Vendor Pages for CVE-2026-6539 (1)

IV. Related Vulnerabilities

Same product: Notepad++
Same vendor: Notepad++
Same weakness: CWE-134

V. Comments for CVE-2026-6539

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