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CVE-2026-5525— Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS

Quick assessment

Affected
Notepad++ Project 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版本存在安全漏洞，该漏洞源于文件拖放处理组件在用户拖放恰好259字符且无尾部反斜杠的目录路径时，会追加反斜杠和空终止符而缺乏适当的边界检查，可能导致栈缓冲区溢出和应用程序崩溃。

CVSS 6.0 · Medium EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2026-5525

Vulnerability Information
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Vulnerability Title
Stack-Based Buffer Overflow in Notepad++ File Drop Handler leads to DoS
Source: CVE Program / CVE List V5
Vulnerability Description
A stack-based buffer overflow vulnerability exists in Notepad++ version 8.9.3 in the file drop handler component. When a user drags and drops a directory path of exactly 259 characters without a trailing backslash, the application appends a backslash and null terminator without proper bounds checking, resulting in a stack buffer overflow and application crash (STATUS_STACK_BUFFER_OVERRUN).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
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++ 8.9.3版本存在安全漏洞，该漏洞源于文件拖放处理组件在用户拖放恰好259字符且无尾部反斜杠的目录路径时，会追加反斜杠和空终止符而缺乏适当的边界检查，可能导致栈缓冲区溢出和应用程序崩溃。
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++ Project Notepad++ 8.9.3 -

II. Public POCs for CVE-2026-5525

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III. Intelligence Information for CVE-2026-5525

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Patches & Fixes for CVE-2026-5525 (2)

Proof of Concept for CVE-2026-5525 (1)

IV. Related Vulnerabilities

Same product: Notepad++
Same weakness: CWE-121

V. Comments for CVE-2026-5525

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