CVE-2026-65794: Windows SMB Client Information Disclosure Vulnerability

Published Aug 11, 2026
·
Updated

Buffer over-read in Windows SMB Client allows an unauthorized attacker to disclose information over a network.

Other sources

Windows SMB Client Information Disclosure Vulnerability

— Microsoft

Affected Software

31 affected componentsFixes available
Microsoft Windows SMB Client
Microsoft Windows Server 2016<10.0.14393.9418
10.0.14393.9418
Microsoft Windows 10=1607
10.0.14393.9418
Microsoft Windows Server 2012<6.2.9200.26279
6.2.9200.26279
Microsoft Windows 11=26H1
10.0.28000.2704
Microsoft Windows 11=26H1
10.0.28000.2704
Microsoft Windows 10=1607
10.0.14393.9418
Microsoft Windows 11=24H2
10.0.26100.916810.0.26000.9106
Microsoft Windows Server 2012<6.2.9200.26279
6.2.9200.26279
Microsoft Windows Server 2012 R2<6.3.9600.23337
6.3.9600.23337
Microsoft Windows 11=24H2
10.0.26100.916810.0.26100.9106
Microsoft Windows Server 2016<10.0.14393.9418
10.0.14393.9418
Microsoft Windows Server 2025<10.0.26100.33296, <10.0.26100.33222
10.0.26100.3329610.0.26100.33222
Microsoft Windows 11=23H2
10.0.22631.7517
Microsoft Windows 11=25H2
10.0.26200.916810.0.26100.9106
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 Server 2012 R2<6.3.9600.23337
6.3.9600.23337
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 2022<10.0.20348.5499, <10.0.20348.5440
10.0.20348.549910.0.20348.5440
Microsoft Windows 10=22H2
10.0.19045.7663
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
Microsoft Windows Server 2019<10.0.17763.9115
10.0.17763.9115
Microsoft Windows 10=1809
10.0.17763.9115

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 10.0.14393.9418Patch KB5120418
  2. Upgrade

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

    Fixed in 10.0.28000.2704Patch KB5121000
  3. Upgrade

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

    Fixed in 6.2.9200.26279Patch KB5120385
  4. Upgrade

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

    Fixed in 6.3.9600.23337Patch KB5120386
  5. 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
  6. 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
  7. 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
  8. Upgrade

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

    Fixed in 10.0.22631.7517Patch KB5120240
  9. 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
  10. Upgrade

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

    Fixed in 10.0.19045.7663Patch KB5120249
  11. Upgrade

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

    Fixed in 10.0.19044.7663Patch KB5120249
  12. 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
  13. Upgrade

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

    Fixed in 10.0.17763.9115Patch KB5120238

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·05:06 PM
Data Sourced
via MITRE·05:06 PM
DescriptionSeverity
Data Sourced
via NVD·05:18 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-65794?

The severity of CVE-2026-65794 is medium with a score of 6.5.

2

What does CVE-2026-65794 affect?

CVE-2026-65794 affects various versions of Microsoft Windows, including Windows 10, Windows 11, and several Windows Server editions.

3

How does CVE-2026-65794 impact users?

CVE-2026-65794 allows an unauthorized attacker to disclose sensitive information over a network due to a buffer over-read in the Windows SMB Client.

4

Are there any known mitigations for CVE-2026-65794?

As of now, specific mitigations for CVE-2026-65794 are not detailed, but applying relevant security updates from Microsoft is recommended.

5

When was CVE-2026-65794 published?

CVE-2026-65794 was published on August 11, 2026.

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