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CVE-2026-71350 Microsoft CVE debrief

A heap-based buffer overflow vulnerability exists in the Windows Spaceport.sys driver, which could allow an unauthorized attacker to execute code with a physical attack. The vulnerability has a CVSS score of 6.8 and is classified as MEDIUM severity. This vulnerability is particularly concerning because it can be exploited with a physical attack, which could lead to unauthorized code execution and compromise of vulnerable systems. Defenders responsible for patching and securing Windows systems, especially those with physical access to untrusted devices, should prioritize patching vulnerable systems. The vulnerability is described in the CVE Program record and the NVD vulnerability

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
MEDIUM 6.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-09-08
Original CVE updated
2026-09-22
Advisory published
2026-09-08
Advisory updated
2026-09-22

Who should care

Defenders responsible for patching and securing Windows systems, especially those with physical access to untrusted devices, should prioritize patching vulnerable systems.

Why it matters

The vulnerability allows an unauthorized attacker to execute code with a physical attack, which could lead to unauthorized code execution and compromise of vulnerable systems.

  • Patching vulnerable systems can prevent unauthorized code execution
  • Verifying and applying the Microsoft patch can mitigate the vulnerability
  • Monitoring systems for suspicious activity can help detect potential attacks

Technical summary

The vulnerability exists in the Windows Spaceport.sys driver and could allow an unauthorized attacker to execute code with a physical attack. The vulnerability has a CVSS score of 6.8 and is classified as MEDIUM severity. This vulnerability is caused by a heap-based buffer overflow, which can be exploited by an attacker with physical access to the system. To mitigate this vulnerability, defenders should prioritize patching vulnerable systems, especially those with physical access to untrusted devices. The CVE Program record and the NVD vulnerability detail page

Defensive priority

Defenders should prioritize patching vulnerable systems, especially those with physical access to untrusted devices.

Recommended defensive actions

  • Patch vulnerable systems, especially those with physical access to untrusted devices
  • Verify and apply the Microsoft patch
  • Monitor systems for suspicious activity

Evidence notes

The vulnerability is described in the CVE Program record and the NVD vulnerability detail page. Microsoft has provided a patch and vendor advisory for this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-71350 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-71350

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

  • CVE-2026-71350 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-71350

    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.