CVE-2026-21523

GitHub Copilot and Visual Studio Code Remote Code Execution Vulnerability

CVE-2026-21523 is fixed in 2 products on 1 platform, first by Microsoft Visual Studio Code Insiders 1.110.0, released February 5, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

8.0

Important

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0076

55th percentile

<p>Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network.</p>

Where it's fixed

Product	Fixed in	Fix	Released
Windows apps
Microsoft Visual Studio Code	1.109.2	Microsoft Visual Studio Code 1.109.2	Feb 10, 2026
Microsoft Visual Studio Code Insiders	1.110.0	Microsoft Visual Studio Code Insiders 1.110.0	Feb 5, 2026

Details

Published
February 10, 2026
Weakness
Time-of-check Time-of-use (TOCTOU) Race Condition
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21523

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