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Windows 10 1809Operating system · Microsoft

CVE-2026-54129

HIGH · 7.8 CVSS v3.1 Published 2026-07-14
Fix available
A fix is available. Upgrade to 10.0.17763.9020 / 10.0.19044.7548 or later.
See remediation →
80/100
Remediation priority · High
Zero-click 5 weeks old

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Use after free in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

In the news

Third-party coverage
Trending covered by 1 outlet this week · latest 1mo ago

Surfaced from public web coverage — external links open in a new tab.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A use-after-free vulnerability in Windows Hyper-V allows a locally authorized attacker to exploit improper memory management to elevate privileges. The attacker must have some level of access to the target system initially.

MitigationApply Microsoft security updates for Windows Hyper-V as they become available. Prioritize patching Hyper-V hosts in production environments given the privilege escalation risk.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Windows 10 1809Operating system
Affected:< 10.0.17763.9020
Windows 10 21h2Operating system
Affected:< 10.0.19044.7548
Windows 10 22h2Operating system
Affected:< 10.0.19045.7548
Windows 11 24h2Operating system
Affected:< 10.0.26100.8875
Windows 11 25h2Operating system
Affected:< 10.0.26200.8875
Windows 11 26h1Operating system
Affected:< 10.0.28000.2269< 10.0.28000.2525
Windows Server 2019Operating system
Affected:< 10.0.17763.9020
Windows Server 2022Operating system
Affected:< 10.0.20348.5386

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Confirm Hyper-V is installed
    Open PowerShell and run: Get-WindowsOptionalFeature -Online -FeatureName *Hyper-V* or check via 'Get-WindowsFeature' on Server editions. Look for Hyper-V role or hypervisor present.
    Affected if Hyper-V is not installed on the system - the vulnerability only applies to systems with Hyper-V enabled
  2. Check installed Windows version
    Run 'winver' from Run dialog, or in PowerShell run: [System.Environment]::OSVersion.Version or Get-ComputerInfo | Select-Object WindowsVersion,OsVersion
    Affected if The version number is less than the fixed build numbers for your Windows release (17763.9020 for 1809/Server 2019, 19044.7548 for 21h2, 19045.7548 for 22h2, 26100.8875 for 24h2, 26200.8875 for 25h2, 28000.2269/2525 for 26h1, 20348.5386 for Server 2022)
  3. Verify Hyper-V services are running
    In PowerShell run: Get-Service *Hyper-V* | Select-Object Name,Status. Specifically check if vmcompute service is running.
    Affected if Hyper-V services (vmcompute, vmms, etc.) are in a Running state - the vulnerability requires the Hyper-V hypervisor to be active

You are affected if Hyper-V is installed/enabled AND your Windows build version is below the fixed version for your specific Windows release.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 10.0.17763.9020 / 10.0.19044.7548 / 10.0.19045.7548 or later
Fixed in 10.0.17763.902010.0.19044.754810.0.19045.7548
Interim mitigation

Apply Microsoft security updates for Windows Hyper-V as they become available. Prioritize patching Hyper-V hosts in production environments given the privilege escalation risk.

Recommended fix High confidence

Upgrade to the fixed build: Windows 10 1809/Server 2019 to 10.0.17763.9020, Windows 10 21h2 to 10.0.19044.7548, Windows 10 22h2 to 10.0.19045.7548, Windows 11 24h2 to 10.0.26100.8875, Windows 11 25h2 to 10.0.26200.8875, Windows 11 26h1 to 10.0.28000.2525, or Windows Server 2022 to 10.0.20348.5386

  1. Identify the Windows version and build number on the affected system by running 'winver' or 'systeminfo'
  2. Determine which affected version category applies (Windows 10 1809, 21h2, 22h2, Windows 11 24h2/25h2/26h1, Server 2019, or Server 2022)
  3. Open Windows Settings > Update & Security > Windows Update
  4. Click 'Check for updates' and install all available updates
  5. Alternatively, manually download and install the specific security update from the Microsoft Catalog for the fixed build number: 10.0.17763.9020 (1809/Server 2019), 10.0.19044.7548 (21h2), 10.0.19045.7548 (22h2), 10.0.26100.8875 (24h2), 10.0.26200.8875 (25h2), 10.0.28000.2525 (26h1), or 10.0.20348.5386 (Server 2022)
  6. Restart the system after installing updates
  7. Verify the build number matches the fixed version using 'winver'
Caveat Standard Windows update risks apply - ensure backups exist and test in non-production environments if possible

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Windows 10 1809 Scoped from the published advisory
  • Consultation6.0 h
  • Implementation12.0 h
  • Testing8.0 h
  • Review / QA4.0 h
30.0 hours of engineering $5,280
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Scan for this in your stack

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-54129 in production — separate from our analysis above.

No notes yet

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data