CVE-2026-83862

Summary

A use-after-free vulnerability in Windows Network Load Balancing allows remote attackers to execute arbitrary code with high privileges. This flaw occurs when the system frees memory that is still being referenced, potentially leading to memory corruption and code execution.

Exploitability

Exploitation appears moderately difficult as it requires a network-based attack against a vulnerable Windows NLB service, but the critical CVSS score suggests reliable remote code execution is achievable with proper conditions.

Blast radius

The impact could be severe across enterprise networks that rely on NLB for load distribution, potentially allowing attackers to compromise entire network infrastructure and escalate privileges across multiple systems.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Apply the Windows Update KB5042838 or later patch immediately to address this vulnerability in all affected NLB implementations.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.