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5.5
CVE-2026-54997: Windows SMB Can Leak Local Information
CVE-2026-54997 · published 3 months ago
Summary
An authorized attacker on a Windows system can access sensitive local information, such as file paths and system details. This could be used to gather information for future attacks. To protect your systems, ensure you have the latest Windows updates installed and apply any recommended security patches.
What to do
- Update microsoft windows 10 version 1607 to version 10.0.14393.9339 or later.
- Update microsoft windows 10 version 1809 to version 10.0.17763.9020 or later.
- Update microsoft windows 10 version 21h2 to version 10.0.19044.7548 or later.
- Update microsoft windows 10 version 22h2 to version 10.0.19045.7548 or later.
- Update microsoft windows 11 version 24h2 to version 10.0.26100.8875 or later.
- Update microsoft windows 11 version 25h2 to version 10.0.26200.8875 or later.
- Update microsoft windows 11 version 26h1 to version 10.0.28000.2525 or later.
- Update microsoft windows server 2012 to version 6.2.9200.26226 or later.
- Update microsoft windows server 2012 (server core installation) to version 6.2.9200.26226 or later.
- Update microsoft windows server 2012 r2 to version 6.3.9600.23291 or later.
- Update microsoft windows server 2012 r2 (server core installation) to version 6.3.9600.23291 or later.
- Update microsoft windows server 2016 to version 10.0.14393.9339 or later.
- Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9339 or later.
- Update microsoft windows server 2019 to version 10.0.17763.9020 or later.
- Update microsoft windows server 2019 (server core installation) to version 10.0.17763.9020 or later.
- Update microsoft windows server 2022 to version 10.0.20348.5386 or later.
- Update microsoft windows server 2025 to version 10.0.26100.33158 or later.
- Update microsoft windows server 2025 (server core installation) to version 10.0.26100.33158 or later.
- Update microsoft windows_10_1607 to version 10.0.14393.9339 or later.
- Update microsoft windows_10_1809 to version 10.0.17763.9020 or later.
- Update microsoft windows_10_21h2 to version 10.0.19044.7548 or later.
- Update microsoft windows_10_22h2 to version 10.0.19045.7548 or later.
- Update microsoft windows_11_24h2 to version 10.0.26100.8875 or later.
- Update microsoft windows_11_25h2 to version 10.0.26200.8875 or later.
- Update microsoft windows_11_26h1 to version 10.0.28000.2525 or later.
- Update microsoft windows_server_2016 to version 10.0.14393.9339 or later.
- Update microsoft windows_server_2019 to version 10.0.17763.9020 or later.
- Update microsoft windows_server_2022 to version 10.0.20348.5386 or later.
- Update microsoft windows_server_2025 to version 10.0.26100.33158 or later.
Affected software
| Vendor | Product | Affected versions |
|---|---|---|
| microsoft | windows 10 version 1607 | < 10.0.14393.9339 |
| microsoft | windows 10 version 1809 | < 10.0.17763.9020 |
| microsoft | windows 10 version 21h2 | < 10.0.19044.7548 |
| microsoft | windows 10 version 22h2 | < 10.0.19045.7548 |
| microsoft | windows 11 version 24h2 | < 10.0.26100.8875 |
| microsoft | windows 11 version 25h2 | < 10.0.26200.8875 |
| microsoft | windows 11 version 26h1 | < 10.0.28000.2525 |
| microsoft | windows server 2012 | < 6.2.9200.26226 |
| microsoft | windows server 2012 (server core installation) | < 6.2.9200.26226 |
| microsoft | windows server 2012 r2 | < 6.3.9600.23291 |
| microsoft | windows server 2012 r2 (server core installation) | < 6.3.9600.23291 |
| microsoft | windows server 2016 | < 10.0.14393.9339 |
| microsoft | windows server 2016 (server core installation) | < 10.0.14393.9339 |
| microsoft | windows server 2019 | < 10.0.17763.9020 |
| microsoft | windows server 2019 (server core installation) | < 10.0.17763.9020 |
| microsoft | windows server 2022 | < 10.0.20348.5386 |
| microsoft | windows server 2025 | < 10.0.26100.33158 |
| microsoft | windows server 2025 (server core installation) | < 10.0.26100.33158 |
| microsoft | windows_10_1607 |
< 10.0.14393.9339 cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_1809 |
< 10.0.17763.9020 cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* |
| microsoft | windows_10_21h2 |
< 10.0.19044.7548 cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_10_22h2 |
< 10.0.19045.7548 cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_24h2 |
< 10.0.26100.8875 cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_25h2 |
< 10.0.26200.8875 cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:* |
| microsoft | windows_11_26h1 |
< 10.0.28000.2525 cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:* |
| microsoft | windows_server_2012 |
r2 cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* |
| microsoft | windows_server_2016 |
< 10.0.14393.9339 cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2019 |
< 10.0.17763.9020 cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2022 |
< 10.0.20348.5386 cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* |
| microsoft | windows_server_2025 |
< 10.0.26100.33158 cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* |
Original advisory text
Windows SMB Information Disclosure Vulnerability
Use of uninitialized resource in Windows SMB allows an authorized attacker to disclose information locally.
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54997 vendor-advisory patch
Internet-facing
60 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker partial control
Type
CWE-908Use of Uninitialized Resource
Timeline
Published14 Jul 2026
Updated4 Nov 2026
First seen14 Jul 2026
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