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Github CVE-2026-21523

HIGH
Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367)
2026-02-10 secure@microsoft.com
Github Race Condition AI / ML Visual Studio Code
8.0
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
CVE Published
Feb 10, 2026 - 18:16 nvd
HIGH 8.0

DescriptionNVD

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.

AnalysisAI

Authenticated users can exploit a race condition in GitHub Copilot and Visual Studio Code to execute arbitrary code remotely by manipulating file state between verification and use. This vulnerability affects users with network access to these development tools and requires user interaction to trigger. …

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RemediationAI

Within 24 hours: Inventory all GitHub Copilot and Visual Studio installations across the organization and disable the affected Copilot feature pending patch availability. Within 7 days: Communicate vulnerability details to all developers, establish code review protocols for Copilot-generated code, and monitor for suspicious activity. …

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CVE-2026-21523 vulnerability details – vuln.today
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