CVE-2026-45584 Microsoft Defender Remote Code Execution Vulnerability
An unauthorized attacker can execute arbitrary code remotely via a heap-based buffer overflow in the Microsoft Malware Protection Engine.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45584?
CVE-2026-45584 is a high-severity memory corruption vulnerability in Microsoft Malware Protection Engine, published on 20 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-45584?
It affects 1 product.
Products include Microsoft Malware Protection Engine.
How do I fix CVE-2026-45584?
No fix has been published for CVE-2026-45584 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-2026-45584 being exploited?
There is no known exploitation of CVE-2026-45584 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Malware Protection Engine
Sources
Also known as GHSA-f7rp-9ghh-f4gm.