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CVE-2026-50518 Microsoft CVE debrief

A critical vulnerability, CVE-2026-50518, was found in Windows DHCP Server. This heap-based buffer overflow allows an unauthorized attacker to execute code over a network. The CVE record was published on 2026-07-14T18:17:58.373Z and was last modified on 2026-07-22T15:15:16.043Z. The vulnerability has a CVSS score of 9.8 and is classified as CRITICAL. It affects various versions of Windows 10, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. System administrators and security teams should prioritize patching this vulnerability to prevent potential code execution attacks.

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
CRITICAL 9.8
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 security teams responsible for Windows DHCP Server installations should prioritize patching this vulnerability to prevent potential code execution attacks. This includes teams managing Windows 10, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025.

Technical summary

CVE-2026-50518 is a heap-based buffer overflow vulnerability in Windows DHCP Server, classified as CRITICAL with a CVSS score of 9.8. It allows an attacker to execute code over a network without requiring user interaction. The vulnerability affects various versions of Windows 10, Windows Server 2012, Windows Server 2016, Windows Server 2019, Windows Server 2022, and Windows Server 2025. System administrators and security teams should prioritize patching this vulnerability to prevent potential code execution attacks. Evidence from the CVE record and NVD detail supports this assessment, and defenders should verify affected systems and apply patches or mitigations accordingly.

Defensive priority

High priority should be given to patching this vulnerability due to its critical severity and potential for code execution.

Recommended defensive actions

  • Apply the vendor patch from Microsoft
  • Review and update inventory of Windows DHCP Server installations
  • Implement compensating controls such as network segmentation and monitoring
  • Verify and enforce secure configuration of Windows DHCP Server
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD detail provide information on the vulnerability. Microsoft has released a patch and advisory for this vulnerability. Evidence is limited to public sources and may not reflect the full scope or impact of the vulnerability. Defenders should verify affected systems and apply patches or mitigations accordingly. Additional information from other sources is needed to fully understand the vulnerability's impact.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-50518 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-50518

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

  • CVE-2026-50518 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-50518

    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.