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CVE-2026-56189 Microsoft CVE debrief

A high-severity vulnerability, CVE-2026-56189, exists in Microsoft Windows Media Foundation, allowing an unauthorized attacker to execute code locally via a heap-based buffer overflow. This type of vulnerability can be particularly dangerous as it allows for local code execution, potentially leading to system compromise. The vulnerability has a CVSS score of 7.8 and is classified as HIGH severity. System administrators and users of Microsoft Windows Media Foundation should be aware of this vulnerability and take necessary precautions to prevent exploitation. The vulnerability is caused by improper handling of multimedia data, which can lead to a buffer overflow condition.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
HIGH 7.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-22
Advisory published
2026-07-14
Advisory updated
2026-07-22

Who should care

System administrators and users of Microsoft Windows Media Foundation should be aware of this vulnerability and take necessary precautions to prevent exploitation. This includes ensuring that Windows Media Foundation is up-to-date with the latest security patches and implementing additional security measures, such as monitoring and intrusion detection.

Technical summary

CVE-2026-56189 is a heap-based buffer overflow vulnerability 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 is classified as HIGH severity. The vulnerability is caused by improper handling of multimedia data, which can lead to a buffer overflow condition. This can allow an attacker to execute arbitrary code on the system.

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 to fix the vulnerability.
  • Ensure that Windows Media Foundation is up-to-date with the latest security patches.
  • Implement additional security measures, such as monitoring and intrusion detection, to detect and prevent exploitation attempts.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record was published on 2026-07-14T18:18:28.997Z and was last modified on 2026-07-22T11:41:07.990Z. The NVD entry is currently Analyzed. The vulnerability affects Microsoft Windows Media Foundation, which is a critical component for handling multimedia data. The heap-based buffer overflow could allow an attacker to execute arbitrary code on the system. Evidence is based on CVE and NVD information, which may have limitations in scope and accuracy.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-56189 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-56189

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

  • CVE-2026-56189 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-56189

    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.