CVE-2026-4744 PUBLISHED

Notepad3 Bundled Oniguruma compile_string_node() Heap Buffer Overflow via Crafted Regex Pattern Allows Arbitrary Code Execution

Assigner: GovTech CSG
Reserved: 24.03.2026 Published: 24.03.2026 Updated: 24.03.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 9.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	High	Confidentiality	High
Attack Complexity	Low	Integrity	High	Integrity	High
Attack Requirements	None	Availability	High	Availability	High
Privileges Required	None
User Interaction	Active

CVSS 4.0

Product Status

Vendor	rizonesoft
Product	Notepad3
Versions	Default: affected affected from 0 to 6.25.714.1 (excl.)

Credits

TITAN Team (titancaproject@gmail.com) reporter

References

https://github.com/rizonesoft/Notepad3/pull/5392

Problem Types

CWE-125 Out-of-bounds Read CWE