Windows Hyper-V Guest-to-Host RCE via Out-of-Bounds Read
CVE-2026-45641 is a Windows Hyper-V vulnerability described by Microsoft as an out-of-bounds read, with advisory context also characterizing it as a type confusion/out-of-bounds read issue. The flaw affects Windows Hyper-V and can be triggered from a guest VM context. Available advisory detail indicates that an attacker can send specially crafted file operation requests to VM hardware resources to reach the vulnerable condition. Successful exploitation allows code execution on the Hyper-V host, making this a guest-to-host escape scenario. Microsoft’s published CVSS v3.1 vector is AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Are you exposed to this one?
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A critical remote code execution vulnerability in Windows Hyper-V that can enable guest-to-host escape.
A critical remote code execution vulnerability in Windows Hyper-V caused by out-of-bounds read conditions that may allow guest-to-host compromise.
A Windows Hyper-V out-of-bounds read vulnerability that allows local code execution by an unauthorized attacker.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.