CVE-2026-4744 Memory corruption in Notepad3
A heap buffer overflow in Notepad3's bundled Oniguruma library allows arbitrary code execution via a crafted regex pattern.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-4744?
CVE-2026-4744 is a critical memory corruption vulnerability in rizonesoft Notepad3, published on 24 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-4744?
How do I fix CVE-2026-4744?
No fix has been published for CVE-2026-4744 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-4744 being exploited?
There is no known exploitation of CVE-2026-4744 in the wild and no public exploit code.
Sources
Also known as GHSA-wfh3-g987-f73h.