Github
CVE-2026-21523
HIGH
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
2DescriptionCVE.org
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. No patch is currently available to address this high-severity flaw.
Technical ContextAI
Affects Visual Studio Code. 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.
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same technique Race Condition
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External POC / Exploit Code
Leaving vuln.today