CVE-2025-10101 Avast antivirus heap buffer OOB read when scanning a malformed Mach-O file
A heap buffer out-of-bounds read in Avast, AVG, and Norton antivirus engines allows local attackers to execute code or cause denial of service via malformed Mach-O files.
- 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-2025-10101?
CVE-2025-10101 is a high-severity memory corruption vulnerability in Gen Digital AVG Antivirus, published on 1 Dec 2025. 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
Heap buffer out-of-bounds read vulnerability in Avast Antivirus when scanning a malformed Mach-O file may allow Local Execution of Code or Denial-of-Service of the antivirus process.
This issue affects Avast Antivirus, AVG Antivirus, Norton Antivirus, Avast One, and Avast Business Antivirus on Windows, macOS, and Linux for virus definition builds before VPS 25090300.
The affected scanning logic is delivered through a shared Gen Digital virus definition update stream. The same stream feeds the consumer antivirus products listed in this advisory and other Gen Digital products that embed the same engine. Mitigation flows through this update channel; installations at or above the listed build are not vulnerable regardless of which product consumes the stream.
Weakness: CWE-125
Which versions are affected by CVE-2025-10101?
How do I fix CVE-2025-10101?
No fix has been published for CVE-2025-10101 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-2025-10101 being exploited?
There is no known exploitation of CVE-2025-10101 in the wild and no public exploit code.
Sources
Also known as GHSA-5wgw-665q-2r54.