CVE-2026-105016

Summary

A heap-based buffer overflow in Microsoft QUIC allows remote attackers to execute arbitrary code with high privileges. This vulnerability affects the QUIC protocol implementation and can be exploited over the network without authentication.

Exploitability

Exploitation is likely straightforward for skilled attackers with minimal preconditions, requiring only network access to a vulnerable QUIC endpoint with no authentication required.

Blast radius

The impact could be severe across all systems using Microsoft QUIC, potentially allowing attackers to gain full system control on affected servers and clients that process QUIC traffic.

Detection

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

Prioritized remediation

Deploy the Microsoft Windows Update KB5042119 or upgrade to Microsoft QUIC version 1.4.0 or later immediately.

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