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CVE-2026-54758— Notepad++: Stack Buffer Overflow in expandNppEnvironmentStrs

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notepad++个人开发者开源的一款轻量级的代码与文本编辑工具。 Notepad++ 8.9.7之前版本存在缓冲区错误漏洞，该漏洞源于expandNppEnvironmentStrs函数将变量名复制到固定大小栈缓冲区时未限制m循环索引，可能导致栈数据损坏、进程终止及执行代码。

CVSS 7.8 · High EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
notepad-plus-plus notepad-plus-plus < 8.9.7 affected
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I. Basic Information for CVE-2026-54758

Vulnerability Information
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Vulnerability Title
Notepad++: Stack Buffer Overflow in expandNppEnvironmentStrs
Source: CVE Program / CVE List V5
Vulnerability Description
Notepad++ is a free and open-source source code editor. Prior to 8.9.7, the expandNppEnvironmentStrs function in PowerEditor/src/WinControls/StaticDialog/RunDlg/RunDlg.cpp copies a Notepad++ variable name between $( and ) into the fixed-size wchar_t str[MAX_PATH] stack buffer without bounding the m loop index, allowing a name of 260 or more characters to corrupt adjacent stack data, terminate the process through __report_gsfailure, and potentially execute code. This issue is fixed in version 8.9.7.
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
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
Notepad++ 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
notepad++是notepad++个人开发者开源的一款轻量级的代码与文本编辑工具。 Notepad++ 8.9.7之前版本存在缓冲区错误漏洞，该漏洞源于expandNppEnvironmentStrs函数将变量名复制到固定大小栈缓冲区时未限制m循环索引，可能导致栈数据损坏、进程终止及执行代码。
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 < 8.9.7 -

II. Public POCs for CVE-2026-54758

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8200 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-54758

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Patches & Fixes for CVE-2026-54758 (1)

Vendor Advisories for CVE-2026-54758 (1)

Vendor Pages for CVE-2026-54758 (1)

Same Patch Batch · notepad-plus-plus · 2026-08-17 · 4 CVEs total

CVE-2026-57233 8.1 HIGH Notepad++: Path Traversal (Zip Slip) in WinGup Plugin Extraction
CVE-2026-71858 5.4 MEDIUM Notepad++: shortcuts.xml Macro HMAC Bypass Enables Conditional Elevated Command Execution
CVE-2026-52886 5.1 MEDIUM Notepad++: session.xml backupFilePath starts_with Bypass

IV. Related Vulnerabilities

Same product: notepad-plus-plus
Same vendor: notepad-plus-plus
Same weakness: CWE-121

V. Comments for CVE-2026-54758

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