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CVE-2026-21248 is a heap-based buffer overflow vulnerability in Windows Hyper-V. The flaw allows a locally authorized attacker to trigger memory corruption in the Hyper-V component, leading to code execution. Available reporting identifies the issue as a heap overflow and classifies it as a Windows Hyper-V remote code execution vulnerability, but the described attack condition specifies local exploitation by an authorized attacker rather than unauthenticated network-only compromise. Specific vulnerable functions, code paths, and triggering inputs are not currently available.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A remote code execution vulnerability affecting Windows Hyper-V.
A remote code execution vulnerability in Windows Hyper-V (no additional details provided in the content).
A remote code execution vulnerability in Windows Hyper-V.
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.