Hyper-V is a widely used virtualization platform; a local code-execution flaw could impact hosts/VMs across enterprises, with high visibility.
CVE-2026-45607
Out-of-bounds read in Windows Hyper-V enables local code execution.
Is CVE-2026-45607 being exploited?
Not confirmed. CVE-2026-45607 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.36% probability of exploitation in the next 30 days.
How severe is CVE-2026-45607?
CVE-2026-45607 is rated High with a CVSS score of 8.4. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-45607?
Yes. A fix has been recorded for CVE-2026-45607. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-45607 affect?
CVE-2026-45607 affects Windows Hyper-V, Microsoft Windows Server virtualization. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-45607?
Monitor for updates and patch Hyper-V hosts when available.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Local attacker can execute arbitrary code on the host/VM via Hyper-V memory read flaw.
Patch when possible
- affected>= 10.0.14393.0 and < 10.0.14393.9234
- affected>= 10.0.17763.0 and < 10.0.17763.8880
- affected>= 10.0.19044.0 and < 10.0.19044.7417
- affected>= 10.0.19045.0 and < 10.0.19045.7417
- affected>= 10.0.22631.0 and < 10.0.22631.7219
- affected>= 10.0.22631.0 and < 10.0.22631.7219
- affected>= 10.0.26100.0 and < 10.0.26100.8655
- affected>= 10.0.26200.0 and < 10.0.26200.8655
- affected>= 10.0.28000.0 and < 10.0.28000.2269
- affected>= 10.0.14393.0 and < 10.0.14393.9234
- affected>= 10.0.14393.0 and < 10.0.14393.9234
- affected>= 10.0.17763.0 and < 10.0.17763.8880
- affected>= 10.0.17763.0 and < 10.0.17763.8880
- affected>= 10.0.20348.0 and < 10.0.20348.5256
- affected>= 10.0.26100.0 and < 10.0.26100.32995
- affected>= 10.0.26100.0 and < 10.0.26100.32995
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.