gcdRadar
archive/Patch now/AIR-2026-0962
closedclosed 10 Feb 2026Patch now2 Disclosed vulnerabilityAI

CVE-2026-21523: Race condition in GitHub Copilot and Visual Studio

GitHub Copilot, Visual Studio

A time-of-check time-of-use race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network. No active exploitation has been confirmed.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
8.0
EPSS
0.01 · top 45% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
10 Feb 2026
last update
10 Feb 2026
CVE ids
CVE-2026-21523other records

Timeline · 1

  1. 10 Feb 2026CVE-2026-21523: Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute…

Sources · 1

Advisories and databases

  1. 2026-02-10
    CVE-2026-21523: Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute…
    NVD · nvd.nist.gov/vuln/detail/CVE-2026-21523

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Microsoft
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
toctource
dates
happened 10 Feb 2026 · first reported 10 Feb 2026
origin
NVD
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 10:04Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2026-21523: Race condition in GitHub Copilot and Visual Studio

https://gcdradar.vercel.app/incidents/cve-2026-21523-race-condition-in-github-copilot-and-visual-s · AIR-2026-0962 · closed 2026-02-10

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2026-02-10
- AI role: Attack on AI
- Products: GitHub Copilot, Visual Studio
- CVE ids: CVE-2026-21523
- CVSS: 8

## Summary

A time-of-check time-of-use race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute code over a network. No active exploitation has been confirmed.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2026-02-10: CVE-2026-21523: Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute… (https://nvd.nist.gov/vuln/detail/CVE-2026-21523)

## Sources

- 2026-02-10 NVD: CVE-2026-21523: Time-of-check time-of-use (toctou) race condition in GitHub Copilot and Visual Studio allows an authorized attacker to execute… https://nvd.nist.gov/vuln/detail/CVE-2026-21523

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

Related

  1. closed8.8
    GitHub Copilot CVE-2026-21256: RCE via Command Injection in GitHub Copilot and Visual Studio

    Patch now · Disclosed · since 10 Feb 2026 · CVE-2026-21256

    AI
  2. closed8.0
    GitHub Copilot CVE-2026-21257: Privilege Escalation via Command Injection in GitHub Copilot

    Patch now · Disclosed · since 10 Feb 2026 · CVE-2026-21257

    AI
  3. closed7.8
    GitHub Copilot CVE-2025-53773: Command Injection Vulnerability in GitHub Copilot and Visual Studio

    Patch now · Disclosed · since 12 Aug 2025 · CVE-2025-53773

    AI
  4. closed8.8
    GitHub Copilot CVE-2026-21516: Remote Code Execution via Command Injection in GitHub Copilot

    Patch now · Disclosed · since 10 Feb 2026 · CVE-2026-21516

    AI
  5. closed8.8
    GitHub Copilot CVE-2026-21518: Command Injection Vulnerability in GitHub Copilot and VS Code

    Patch now · Disclosed · since 10 Feb 2026 · CVE-2026-21518

    AI
  6. closed7.8
    GitHub Copilot CVE-2026-50510: Code execution vulnerability in GitHub Copilot

    Patch now · Disclosed · since 14 Jul 2026 · CVE-2026-50510

    AI