CVE-2026-54990 Remote Desktop Client Remote Code Execution Vulnerability
Heap-based buffer overflow in the Remote Desktop Client allows unauthorized attackers to execute code over a network.
- 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-2026-54990?
CVE-2026-54990 is a critical memory corruption vulnerability in Microsoft Windows 11 24h2, published on 14 Jul 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 Remote Desktop Client allows an unauthorized attacker to execute code over a network.
Weakness: CWE-122
Which versions are affected by CVE-2026-54990?
It affects 4 products.
Products include Microsoft Windows 11 24h2, Microsoft Windows 11 25h2, Microsoft Windows 11 26h1, Microsoft Windows Server 2025.
How do I fix CVE-2026-54990?
No fix has been published for CVE-2026-54990 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-2026-54990 being exploited?
There is no known exploitation of CVE-2026-54990 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 11 24h2
- CVE-2025-60710 Microsoft Windows Link Following
- CVE-2025-50165 Windows Graphics Component Remote Code Execution Vulnerability
- CVE-2025-21311 Windows NTLM V1 Elevation of Privilege Vulnerability
- CVE-2026-108463 Windows SmartScreen Security Feature Bypass Vulnerability
- CVE-2026-83523 Windows Image Acquisition Remote Code Execution Vulnerability
Sources
Also known as GHSA-q6cx-465r-334m.