CVE-2025-52939 Potential heap-buffer overflow vulnerability in NotepadNext
A heap-buffer overflow in NotepadNext's Lua modules allows attackers to execute arbitrary code or crash the application via crafted input.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-52939?
CVE-2025-52939 is a critical memory corruption vulnerability in dail8859 NotepadNext, published on 23 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Out-of-bounds Write vulnerability in dail8859 NotepadNext (src/lua/src modules). This vulnerability is associated with program files ldebug.C, lvm.C.
This issue affects NotepadNext: through v0.11.
Weakness: CWE-787
Which versions are affected by CVE-2025-52939?
How do I fix CVE-2025-52939?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-52939 being exploited?
There is no known exploitation of CVE-2025-52939 in the wild and no public exploit code.
Sources
Also known as AZL-64404, GHSA-hhj4-3c38-ppmf.