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CVE-2026-83862 Microsoft CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-10-13T18:59:54.406Z and has not been modified since then. This critical remote code execution vulnerability in Windows Network Load Balancing allows an unauthorized attacker to execute code over a network. Affected versions include Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, and others. Defenders should prioritize verifying exposure and applying patches to prevent potential exploitation. The vulnerability is a use-after-free issue in Windows Network Load Balancing. There are no specific exploitation details provided, but defenders should review and be

Vendor
Microsoft
Product
Windows 10 Version 1607
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-13
Original CVE updated
2026-10-13
Advisory published
2026-10-13
Advisory updated
2026-10-13

Who should care

Defenders responsible for Windows Network Load Balancing, network administrators, and security teams should assess exposure and apply patches.

Why it matters

CVE-2026-83862 is a critical remote code execution vulnerability in Windows Network Load Balancing. Defenders should prioritize verifying exposure and applying patches to prevent potential exploitation.

  • Verify exposure of Windows Network Load Balancing to untrusted networks
  • Apply patches for affected Windows versions and configurations
  • Monitor for suspicious network activity related to Windows Network Load Balancing
  • Review and update network segmentation and access controls

Technical summary

A use-after-free vulnerability in Windows Network Load Balancing allows an unauthorized attacker to execute code over a network. Affected versions include Windows 10 Version 1607, Windows 10 Version 1809, Windows Server 2012, and others. The vulnerability can be exploited by an attacker sending a specially crafted request to the Windows Network Load Balancing service. Defenders should prioritize verifying exposure and applying patches for Windows Network Load Balancing, especially for affected versions. The CVE record and source item provide details on the

Defensive priority

Defenders should prioritize verifying exposure and applying patches for Windows Network Load Balancing, especially for affected versions.

Recommended defensive actions

  • Verify exposure of Windows Network Load Balancing to untrusted networks
  • Apply patches for affected Windows versions and configurations
  • Monitor for suspicious network activity related to Windows Network Load Balancing
  • Review and update network segmentation and access controls

Evidence notes

The CVE record and source item provide details on the vulnerability in Windows Network Load Balancing, allowing for remote code execution. Affected versions and configurations are listed, but specific exploitation details are not provided.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-83862 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-83862

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

  • CVE-2026-83862 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-83862

    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.