CVE-2026-21256

GitHub Copilot and Visual Studio Remote Code Execution Vulnerability

State: Published
Severity: 8.8 High
Published: Feb 10, 2026
Updated: Aug 19, 2026
Reserved: Dec 11, 2025

Description

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an unauthorized attacker to execute code over a network.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C	microsoft

Weaknesses

CWE-77 Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-94 Improper Control of Generation of Code ('Code Injection')

Affected Products

Product	Versions
Microsoft Visual Studio 2022 version 17.14Microsoft	17.14.0 to before 17.14.26Affected
Microsoft Visual Studio 2026 version 18.3Microsoft	18.3.0 to before 18.3.0Affected

References

GitHub Copilot and Visual Studio Remote Code Execution Vulnerabilityvendor-advisorypatch

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