CVE-2026-56188: Windows Server Network driver Remote Code Execution Vulnerability

Published Jul 14, 2026
·
Updated

Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Network driver allows an unauthorized attacker to execute code over a network.

Other sources

Windows Server Network driver Remote Code Execution Vulnerability

— Microsoft

Affected Software

42 affected componentsFixes available
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows 10=22H2
10.0.19045.7548
Microsoft Windows 10=21H2
10.0.19044.7548
Microsoft Windows 11=24H2
10.0.26100.8875
Microsoft Windows 10=22H2
10.0.19045.7548
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows 10=22H2
10.0.19045.7548
Microsoft Windows 10=21H2
10.0.19044.7548
Microsoft Windows 10=21H2
10.0.19044.7548
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2012<6.2.9200.26226
6.2.9200.26226
Microsoft Windows Server 2022<10.0.20348.5386
10.0.20348.5386
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows 10=1607
10.0.14393.9339
Microsoft Windows 11=24H2
10.0.26100.8875
Microsoft Windows Server 2016<10.0.14393.9339
10.0.14393.9339
Microsoft Windows 10=1607
10.0.14393.9339
Microsoft Windows 11=26H1
10.0.28000.2525
Microsoft Windows Server 2019<10.0.17763.9020
10.0.17763.9020
Microsoft Windows 10=1809
10.0.17763.9020
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows Server 2012 R2<6.3.9600.23291
6.3.9600.23291
Microsoft Windows Server 2025<10.0.26100.33158
10.0.26100.33158
Microsoft Windows 11=26H1
10.0.28000.2525
Microsoft Windows 10=1809
10.0.17763.9020
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1607<10.0.14393.9339
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows 10 1809<10.0.17763.9020
Microsoft Windows 10 21h2<10.0.19044.7548
Microsoft Windows 10 22h2<10.0.19045.7548
Microsoft Windows 11 24h2<10.0.26100.8875
Microsoft Windows 11 25h2<10.0.26200.8875
Microsoft Windows 11 26h1<10.0.28000.2525
Microsoft Windows Server 2012
Microsoft Windows Server 2012=r2
Microsoft Windows Server 2016<10.0.14393.9339
Microsoft Windows Server 2019<10.0.17763.9020
Microsoft Windows Server 2022<10.0.20348.5386
Microsoft Windows Server 2025<10.0.26100.33158
Microsoft Windows 11=25H2
10.0.26200.8875
Microsoft Windows 11=25H2
10.0.26200.8875

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 10.0.26100.33158Patch KB5099536
  2. Upgrade

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

    Fixed in 10.0.19045.7548Patch KB5099539
  3. Upgrade

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

    Fixed in 10.0.19044.7548Patch KB5099539
  4. Upgrade

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

    Fixed in 10.0.26100.8875Patch KB5101650
  5. Upgrade

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

    Fixed in 10.0.17763.9020Patch KB5099538
  6. Upgrade

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

    Fixed in 6.2.9200.26226Patch KB5099445
  7. Upgrade

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

    Fixed in 10.0.20348.5386Patch KB5099540
  8. Upgrade

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

    Fixed in 10.0.14393.9339Patch KB5099535
  9. Upgrade

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

    Fixed in 10.0.28000.2525Patch KB5101649
  10. Upgrade

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

    Fixed in 6.3.9600.23291Patch KB5099444
  11. Upgrade

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

    Fixed in 10.0.26200.8875Patch KB5101650

Event History

Jul 14, 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·05:09 PM
Data Sourced
via MITRE·05:09 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-56188?

CVE-2026-56188 has a critical severity rating of 9.8.

2

How do I fix CVE-2026-56188?

To fix CVE-2026-56188, apply the security updates provided by Microsoft for the affected versions of Windows.

3

What type of vulnerability is CVE-2026-56188?

CVE-2026-56188 is a remote code execution vulnerability caused by a race condition in the Windows Server Network driver.

4

What software is affected by CVE-2026-56188?

CVE-2026-56188 affects Microsoft Windows 10, Windows 11, Windows Server 2012, 2016, 2019, 2022, and 2025.

5

What is a race condition as it relates to CVE-2026-56188?

A race condition in CVE-2026-56188 occurs due to improper synchronization of concurrent execution using shared resources.

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