CVE-2026-21256: Improper neutralization of special elements used in a command ('command injection') in GitHub Copilot and Visual Studio
Summary
CVE-2026-21256 is a command injection vulnerability (a flaw where attackers can sneak malicious commands into input that a program then executes) found in GitHub Copilot and Visual Studio that allows unauthorized attackers to run code on a network. The vulnerability stems from improper handling of special characters in commands, which means the software doesn't properly filter or neutralize dangerous input before using it.
Vulnerability Details
8.8(high)
EPSS: 0.0%
Classification
Affected Vendors
Related Issues
CVE-2022-21727: Tensorflow is an Open Source Machine Learning Framework. The implementation of shape inference for `Dequantize` is vulne
CVE-2026-22252: LibreChat is a ChatGPT clone with additional features. Prior to v0.8.2-rc2, LibreChat's MCP stdio transport accepts arbi
Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-21256
First tracked: February 15, 2026 at 08:51 PM
Classified by LLM (prompt v3) · confidence: 88%