CVE-2026-83770

Summary

A heap-based buffer overflow in Windows Text Shaping component allows remote attackers to execute arbitrary code with high privileges. This vulnerability arises from improper bounds checking when processing text shaping operations, potentially enabling attackers to gain full system control.

Exploitability

Exploitation is moderately difficult requiring a remote network connection with specific text shaping input, but can be achieved without user interaction once the vulnerable service is accessible.

Blast radius

The vulnerability could affect any Windows system running applications that utilize text shaping functionality, potentially impacting enterprise networks, web servers, and client systems processing rich text content.

Detection

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

Prioritized remediation

Apply the Microsoft Windows Update KB5042851 or later patch immediately to all affected Windows systems.

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