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CVE-2026-54997 Microsoft CVE debrief

A Windows SMB Information Disclosure Vulnerability exists due to the use of an uninitialized resource, allowing an authorized attacker to disclose information locally. Multiple Windows versions and server releases are affected. The vulnerability impacts Windows 10, Windows 11, and various Windows Server releases. System administrators and security teams should assess exposure and apply patches to prevent local information disclosure. The CVE Program and NVD provide official records of the vulnerability.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-10-08
Advisory published
2026-07-14
Advisory updated
2026-10-08

Who should care

System administrators and security teams responsible for Windows systems and servers should assess exposure and apply patches to prevent local information disclosure.

Why it matters

CVE-2026-54997 is a Windows SMB Information Disclosure Vulnerability that allows an authorized attacker to disclose information locally. System administrators and security teams should assess exposure and apply patches to prevent local information disclosure.

  • Verify patch deployment to prevent information disclosure
  • Monitor system logs for potential exploitation attempts
  • Assess exposure of affected Windows systems and servers

Technical summary

The vulnerability exists in Windows SMB due to the use of an uninitialized resource, allowing an authorized attacker to disclose information locally. Affected versions include Windows 10, Windows 11, and various Windows Server releases. The vulnerability can be exploited by an authorized attacker to disclose sensitive information. Microsoft has released a patch for the vulnerability.

Defensive priority

Apply vendor patches to prevent local information disclosure

Recommended defensive actions

  • Apply patches from Microsoft for affected Windows versions
  • Verify system configurations and update vulnerable systems
  • Monitor system logs for potential exploitation attempts

Evidence notes

The CVE Program and NVD provide official records of the vulnerability. Microsoft has released a patch for the vulnerability. The vulnerability is tracked as CVE-2026-54997 and has been publicly disclosed. Affected products include Windows 10, Windows 11, and various Windows Server releases. The vulnerability allows an authorized attacker to disclose information locally.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54997 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54997

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-54997 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54997

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Windows SMB Information Disclosure Vulnerability

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/54xxx/CVE-2026-54997.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54997

    Supplemental source - vendor-advisory, patch

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.