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CVE-2026-45607 is a critical remote code execution vulnerability in Windows Hyper-V caused by an out-of-bounds read. The flaw affects Hyper-V’s handling of guest interactions with virtualized hardware resources and can be triggered through specially crafted file operation requests originating from a guest virtual machine. Available reporting indicates the issue can enable code execution on the host from the guest context, making it a guest-to-host escape scenario in Hyper-V environments.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
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.
An out-of-bounds read vulnerability in Windows Hyper-V that allows local code execution by an unauthorized attacker.
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.