CVE-2026-21256CWE-77CWE-94

GitHub Copilot and Visual Studio Remote Code Execution Vulnerability

High · published February 10, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
67.3
In the wild
Unconfirmed
What it is

⚡ An unauthorized attacker can exploit a command injection vulnerability in GitHub Copilot and Visual Studio, allowing them to execute code over the network — that's a developer's worst nightmare! 🔥 Think of it like a restaurant where a waiter takes your order but misinterprets your request and instead serves a dish laced with surprises from the chef's secret menu — not what you wanted at all! In this scenario, an attacker could execute arbitrary commands on the server, potentially leading to data breaches, unauthorized access to sensitive information, or complete system compromise. It’s absolutely devastating!

Put simply

Think of it like a restaurant where a waiter takes your order but misinterprets your request and instead serves a dish laced with surprises from the chef's secret menu — not what you wanted at all! This vulnerability arises from improper neutralization of special elements in command inputs, allowing attackers to inject malicious commands into network traffic processed by GitHub Copilot and Visual Studio.

What to do

In this scenario, an attacker could execute arbitrary commands on the server, potentially leading to data breaches, unauthorized access to sensitive information, or complete system compromise. It’s absolutely devastating! To secure your systems, update to the latest versions of GitHub Copilot and Visual Studio as soon as possible. Review your code to ensure proper input validation and sanitization to mitigate injection risks. Don't wait! You’ve got this! By following these steps, you'll boost your security posture and protect your projects. 🛡️

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
CVSS v4.0
Not supplied
EPSS
0.01176 · 67.3th percentile
Weaknesses
CWE-77 · Improper Neutralization of Special Elements used in a Command ('Command Injection'); CWE-94 · Improper Control of Generation of Code ('Code Injection')
Published
2026-02-10T17:51Z
EPSS history
Timeline
  • 10 FEB 17:51Z
    GitHub Copilot and Visual Studio Remote Code Execution Vulnerability
    cvelistv5