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CVE-2026-4744— Notepad3 Bundled Oniguruma compile_string_node() Heap Buffer Overflow via Crafted Regex Pattern Allows Arbitrary Code Execution

Quick assessment

Affected
rizonesoft Notepad3
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.

Notepad3是Derick Payne个人开发者的一个Windows文本编辑器。 Notepad3 6.25.714.1之前版本存在安全漏洞，该漏洞源于越界读取，可能导致程序文件regcomp.C出现问题。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-4744

Vulnerability Information
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Vulnerability Title
Notepad3 Bundled Oniguruma compile_string_node() Heap Buffer Overflow via Crafted Regex Pattern Allows Arbitrary Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
Out-of-bounds Read vulnerability in rizonesoft Notepad3 (‎scintilla/oniguruma/src modules). This vulnerability is associated with program files regcomp.C‎. This issue affects Notepad3: before 6.25.714.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/S:N/AU:N/R:U/V:D/RE:L/U:Amber
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Notepad3 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Notepad3是Derick Payne个人开发者的一个Windows文本编辑器。 Notepad3 6.25.714.1之前版本存在安全漏洞，该漏洞源于越界读取，可能导致程序文件regcomp.C出现问题。
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
rizonesoft Notepad3 0 ~ 6.25.714.1 -

II. Public POCs for CVE-2026-4744

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III. Intelligence Information for CVE-2026-4744

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Patches & Fixes for CVE-2026-4744 (1)

IV. Related Vulnerabilities

Same product: Notepad3
Same weakness: CWE-125

V. Comments for CVE-2026-4744

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