Windows Hyper-V Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
MSRC compact vulnerability detail
CVE-2026-21248 · Windows Hyper-V Remote Code Execution Vulnerability
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
Signals
Role: Windows Hyper-V
Remote Code Execution
Exploited: No
Publicly disclosed: No
Exploitability: Exploitation Less Likely
CWE
Patch Diff
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Resolved binary override
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Description
Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to execute code locally.
FAQ / Articles
FAQ
According to the CVSS metric, user interaction is required (UI:R) and privileges required is Low (PR:L). What does that mean for this vulnerability? The file must be stored in a location that allows an attacker write access, enabling the file to be corrupted. An attacker must send a user a crafted file and convince them to load it.
FAQ
According to the CVSS metric, the attack vector is local (AV:L). Why does the CVE title indicate that this is a remote code execution? The word Remote in the title refers to the location of the attacker. This type of exploit is sometimes referred to as Arbitrary Code Execution (ACE). The attack itself is carried out locally. This means an attacker or victim needs to execute code from the local machine to exploit the vulnerability.