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CVE-2026-54993 Microsoft CVE debrief

A heap-based buffer overflow exists in Microsoft Windows Media Foundation, allowing unauthorized attackers to execute code locally. System administrators and users should be aware of this vulnerability due to its high severity and potential for local code execution. The CVE record was published on 2026-07-14T17:17:07.000Z and has not been modified since then. The NVD entry is currently Analyzed. This vulnerability has a CVSS score of 7.8 and a severity of HIGH.

Vendor
Microsoft
Product
Windows 10 Version 1809
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-20
Advisory published
2026-07-14
Advisory updated
2026-07-20

Who should care

System administrators and users of Microsoft Windows Media Foundation should be aware of this vulnerability, as it allows an unauthorized attacker to execute code locally. This vulnerability has a high severity and potential for local code execution, making it a high priority for patching.

Technical summary

A heap-based buffer overflow exists in Microsoft Windows Media Foundation. An unauthorized attacker can exploit this vulnerability to execute code locally. The vulnerability has a CVSS score of 7.8 and a severity of HIGH. Microsoft has provided a vendor advisory and patch for this vulnerability.

Defensive priority

High priority should be given to patching this vulnerability, as it allows for local code execution.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Ensure Windows Media Foundation is up-to-date
  • Monitor system logs for suspicious activity
  • Implement additional security measures to prevent local code execution
  • Review compensating controls for exposed systems while remediation is scheduled and verified

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, including its CVSS score and severity. Microsoft has provided a vendor advisory and patch for this vulnerability. The evidence is limited, and defenders should verify the affected scope and vendor guidance. The CVE record was published on 2026-07-14T17:17:07.000Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-54993 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-54993

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

  • CVE-2026-54993 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-54993

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

Supplemental references

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.