CVE-2026-21256: RCE via Command Injection in GitHub Copilot and Visual Studio
GitHub Copilot, Visual Studio
An improper neutralization issue in GitHub Copilot and Visual Studio permits unauthorized network attackers to execute arbitrary code. A security update has been issued to resolve the flaw.
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
- 8.8
- EPSS
- 0.01 · top 33% · 2026-11-13
- fix status
- Fix status unknown
- first report
- 10 Feb 2026
- last update
- 10 Feb 2026
- CVE ids
Timeline · 1
Sources · 1
Advisories and databases
- 2026-02-10CVE-2026-21256: Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an…NVD · nvd.nist.gov/vuln/detail/CVE-2026-21256
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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
- dates
- happened 10 Feb 2026 · first reported 10 Feb 2026
- origin
- NVDVulnerability 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
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the brief as text
# CVE-2026-21256: RCE via Command Injection in GitHub Copilot and Visual Studio
https://gcdradar.vercel.app/incidents/cve-2026-21256-rce-via-command-injection-in-github-copilot-a · AIR-2026-0960 · 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-2026-21256
- CVSS: 8.8
## Summary
An improper neutralization issue in GitHub Copilot and Visual Studio permits unauthorized network attackers to execute arbitrary code. A security update has been issued to resolve the flaw.
## What to do
No action recorded; read the sources below and the vendor's advisory.
## Latest updates
- 2026-02-10: CVE-2026-21256: Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an… (https://nvd.nist.gov/vuln/detail/CVE-2026-21256)
## Sources
- 2026-02-10 NVD: CVE-2026-21256: Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an… https://nvd.nist.gov/vuln/detail/CVE-2026-21256
Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.Related
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