CVE-2026-61368: Windows Hyper-V Information Disclosure Vulnerability

Published Aug 11, 2026
·
Updated

Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to disclose information locally.

Other sources

Windows Hyper-V Information Disclosure Vulnerability

— Microsoft

Affected Software

26 affected componentsFixes available
Microsoft Windows 11=26H1
10.0.28000.2704
Microsoft Windows Server 2016<10.0.14393.9418
10.0.14393.9418
Microsoft Windows 11=24H2
10.0.26100.916810.0.26100.9106
Microsoft Windows Server 2025<10.0.26100.33296, <10.0.26100.33222
10.0.26100.3329610.0.26100.33222
Microsoft Windows 10=1607
10.0.14393.9418
Microsoft Windows 10=1607
10.0.14393.9418
Microsoft Windows 11=23H2
10.0.22631.7517
Microsoft Windows Server 2016<10.0.14393.9418
10.0.14393.9418
Microsoft Windows 11=26H1
10.0.28000.2704
Microsoft Windows 11=24H2
10.0.26100.916810.0.26000.9106
Microsoft Windows 10=22H2
10.0.19045.7663
Microsoft Windows 11=23H2
10.0.22631.7517
Microsoft Windows Server 2025<10.0.26100.33296, <10.0.26100.33222
10.0.26100.3329610.0.26100.33222
Microsoft Windows 10=22H2
10.0.19045.7663
Microsoft Windows 11=25H2
10.0.26200.916810.0.26100.9106
Microsoft Windows 10=21H2
10.0.19044.7663
Microsoft Windows 11=25H2
10.0.26200.916810.0.26100.9106
Microsoft Windows 10=21H2
10.0.19044.7663
Microsoft Windows 10=22H2
10.0.19045.7663
Microsoft Windows 10=21H2
10.0.19044.7663
Microsoft Windows Server 2019<10.0.17763.9115
10.0.17763.9115
Microsoft Windows Server 2022<10.0.20348.5499, <10.0.20348.5440
10.0.20348.549910.0.20348.5440
Microsoft Windows 10=1809
10.0.17763.9115
Microsoft Windows 10=1809
10.0.17763.9115
Microsoft Windows Server 2019<10.0.17763.9115
10.0.17763.9115
Microsoft Windows Server 2022<10.0.20348.5499, <10.0.20348.5440
10.0.20348.549910.0.20348.5440

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.28000.2704Patch KB5121000
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.14393.9418Patch KB5120418
  3. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.33296Fixed in 10.0.26100.33222Patch KB5120228
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.9168Fixed in 10.0.26100.9106Patch KB5120994
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.22631.7517Patch KB5120240
  6. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26100.9168Fixed in 10.0.26000.9106Patch KB5120994
  7. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19045.7663Patch KB5120249
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.26200.9168Fixed in 10.0.26100.9106Patch KB5120994
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.19044.7663Patch KB5120249
  10. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.17763.9115Patch KB5120238
  11. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 10.0.20348.5499Fixed in 10.0.20348.5440Patch KB5120229

Event History

Aug 11, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:03 PM
Data Sourced
via MITRE·05:03 PM
DescriptionSeverity
Data Sourced
via NVD·05:18 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-61368?

The severity of CVE-2026-61368 is medium with a severity score of 5.

2

What software is affected by CVE-2026-61368?

CVE-2026-61368 affects Microsoft Windows 10, Microsoft Windows 11, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, and Microsoft Windows Server 2025.

3

How do I fix CVE-2026-61368?

To mitigate CVE-2026-61368, ensure that your affected Windows systems are updated with the latest Microsoft security patches.

4

What type of vulnerability is CVE-2026-61368?

CVE-2026-61368 is a heap-based buffer overflow vulnerability that allows for information disclosure.

5

What impact does CVE-2026-61368 have on my system?

CVE-2026-61368 enables an authorized attacker to disclose sensitive information locally on the affected system.

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