CVE-2026-21523
Analyzed Analyzed - Analysis Complete

TOCTOU Race Condition in GitHub Copilot Enables Remote Code Execution

Publication date: 2026-02-10

Last updated on: 2026-02-11

Assigner: Microsoft Corporation

Description
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.

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Meta Information

Published
2026-02-10
Last Modified
2026-02-11
Generated
2026-07-06
AI Q&A
2026-02-10
EPSS Evaluated
2026-07-05
NVD
CVE-2026-21523

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
microsoft visual_studio_code to 1.109.2 (exc)

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-367 The product checks the state of a resource before using that resource, but the resource's state can change between the check and the use in a way that invalidates the results of the check.

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Executive Summary

This vulnerability is a time-of-check time-of-use (TOCTOU) race condition found in GitHub Copilot and Visual Studio. It allows an authorized attacker to execute code over a network by exploiting the timing between checking a condition and using the result of that check.

Impact Analysis

The vulnerability can have a severe impact as it allows an attacker with some level of authorization to execute arbitrary code remotely. This can lead to complete compromise of the affected system, including unauthorized access, data modification, and disruption of availability.

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