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CVE-2026-61368· NVD / CVE Program· CNA microsoft

Windows Hyper-V Information Disclosure Vulnerability

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

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Aug 11, 2026
Updated
Sep 29, 2026
EPSS
0.4% · 35th percentile
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Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
5.5
CNA · microsoft
5.0
0.5 point gap

CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
microsoftwindows 10 1607
microsoftwindows 10 1809
microsoftwindows 10 21h2
microsoftwindows 10 22h2
microsoftwindows 11 23h2
microsoftwindows 11 24h2
microsoftwindows 11 25h2
microsoftwindows 11 26h1
microsoftwindows server 2016
microsoftwindows server 2019
microsoftwindows server 2022
microsoftwindows server 2025

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • microsoft windows server 2016before 10.0.14393.9418
  • microsoft windows server 2019before 10.0.17763.9115
  • microsoft windows server 2022before 10.0.20348.5440
  • microsoft windows server 2025before 10.0.26100.33222

Versions reported by the vendor

Affected version ranges reported by the assigning authority (microsoft). Independent of NVD's CPE analysis and usually ahead of it.

  • Microsoft Windows 10 Version 1607

    • 10.0.14393.0 and later · before 10.0.14393.9418affected

  • Microsoft Windows 10 Version 1809

    • 10.0.17763.0 and later · before 10.0.17763.9121affected

  • Microsoft Windows 10 Version 21H2

    • 10.0.19044.0 and later · before 10.0.19044.7663affected

  • Microsoft Windows 10 Version 22H2

    • 10.0.19045.0 and later · before 10.0.19045.7663affected

  • Microsoft Windows 11 version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.7517affected

  • Microsoft Windows 11 Version 23H2

    • 10.0.22631.0 and later · before 10.0.22631.7517affected

  • Microsoft Windows 11 Version 24H2

    • 10.0.26100.0 and later · before 10.0.26100.9168affected

  • Microsoft Windows 11 Version 25H2

    • 10.0.26200.0 and later · before 10.0.26200.9168affected

  • Microsoft Windows 11 version 26H1

    • 10.0.28000.0 and later · before 10.0.28000.2704affected

  • Microsoft Windows Server 2016

    • 10.0.14393.0 and later · before 10.0.14393.9418affected

  • Microsoft Windows Server 2016 (Server Core installation)

    • 10.0.14393.0 and later · before 10.0.14393.9418affected

  • Microsoft Windows Server 2019

    • 10.0.17763.0 and later · before 10.0.17763.9121affected

Same product

microsoft: all records

Other highest-scoring records for the same primary product.

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Windows 10 Version 1607 for 32-bit Systems10.0.14393.9418 · KB5120418Microsoft (MSRC)
Windows 10 Version 1607 for x64-based Systems10.0.14393.9418 · KB5120418Microsoft (MSRC)
Windows 10 Version 1809 for 32-bit Systems10.0.17763.9121 · KB5120238Microsoft (MSRC)
Windows 10 Version 1809 for x64-based Systems10.0.17763.9121 · KB5120238Microsoft (MSRC)
Windows 10 Version 21H2 for 32-bit Systems10.0.19044.7663 · KB5120249Microsoft (MSRC)
Windows 10 Version 21H2 for ARM64-based Systems10.0.19044.7663 · KB5120249Microsoft (MSRC)
Windows 10 Version 21H2 for x64-based Systems10.0.19044.7663 · KB5120249Microsoft (MSRC)
Windows 10 Version 22H2 for 32-bit Systems10.0.19045.7663 · KB5120249Microsoft (MSRC)
Windows 10 Version 22H2 for ARM64-based Systems10.0.19045.7663 · KB5120249Microsoft (MSRC)
Windows 10 Version 22H2 for x64-based Systems10.0.19045.7663 · KB5120249Microsoft (MSRC)
Windows 11 Version 23H2 for ARM64-based Systems10.0.22631.7517 · KB5120240Microsoft (MSRC)
Windows 11 Version 23H2 for x64-based Systems10.0.22631.7517 · KB5120240Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems10.0.26100.9106 · KB5120994Microsoft (MSRC)
Windows 11 Version 24H2 for ARM64-based Systems10.0.26100.9168 · KB5121003Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems10.0.26100.9106 · KB5120994Microsoft (MSRC)
Windows 11 Version 24H2 for x64-based Systems10.0.26100.9168 · KB5121003Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems10.0.26200.9106 · KB5120994Microsoft (MSRC)
Windows 11 Version 25H2 for ARM64-based Systems10.0.26200.9168 · KB5121003Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems10.0.26200.9106 · KB5120994Microsoft (MSRC)
Windows 11 Version 25H2 for x64-based Systems10.0.26200.9168 · KB5121003Microsoft (MSRC)
Windows 11 Version 26H1 for ARM64-based Systems10.0.28000.2704 · KB5121000Microsoft (MSRC)
Windows 11 version 26H1 for x64-based Systems10.0.28000.2704 · KB5121000Microsoft (MSRC)
Windows Server 201610.0.14393.9418 · KB5120418Microsoft (MSRC)
Windows Server 2016 (Server Core installation)10.0.14393.9418 · KB5120418Microsoft (MSRC)
Windows Server 201910.0.17763.9121 · KB5120238Microsoft (MSRC)
Windows Server 2019 (Server Core installation)10.0.17763.9121 · KB5120238Microsoft (MSRC)
Windows Server 202210.0.20348.5440 · KB5120229Microsoft (MSRC)
Windows Server 202210.0.20348.5499 · KB5120242Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5440 · KB5120229Microsoft (MSRC)
Windows Server 2022 (Server Core installation)10.0.20348.5499 · KB5120242Microsoft (MSRC)

+4

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-8588028 days apartWindows Advanced Local Procedure Call (ALPC) Elevation of Privilege VulnerabilityKEV
    62This week
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    39Monitor
  • CVE-2026-6949128 days apartMicrosoft DirectMusic Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-6949328 days apartWindows Event Logging Service Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-6949628 days apartWindows Compressed Folder Remote Code Execution Vulnerability
    39Monitor
  • CVE-2026-7295028 days apartWindows Routing and Remote Access Service (RRAS) Remote Code Execution Vulnerability
    39Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records