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High severity8.8NVD Advisory· Published Feb 10, 2026· Updated Jun 17, 2026

CVE-2026-21256

CVE-2026-21256

Description

Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio allows an unauthorized attacker to execute code over a network.

Affected products

5
  • Microsoft/Visual Studio2 versions
    cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:-:*:*+ 1 more
    • cpe:2.3:a:microsoft:visual_studio_2022:*:*:*:*:*:-:*:*range: >=17.14.0,<17.14.26
    • (no CPE)
  • GitHub/Copilotllm-fuzzy
  • Microsoft/Microsoft Visual Studio 2022 version 17.14v5
    Range: 17.14.0
  • Microsoft/Microsoft Visual Studio 2026 version 18.3v5
    Range: 18.3.0

Patches

Vulnerability mechanics

References

1

News mentions

0

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