CVE-2026-29783
7.8 · HIGHOverview
CVE-2026-29783 is a high-severity vulnerability affecting github copilot_command_line_interface. It was published on March 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
The shell tool within GitHub Copilot CLI versions prior to and including 0.0.422 can allow arbitrary code execution through crafted bash parameter expansion patterns. An attacker who can influence the commands executed by the agent (e.g., via prompt injection through repository files, MCP server responses, or user instructions) can exploit bash parameter transformation operators to execute hidden commands, bypassing the safety assessment that classifies commands as "read-only." This has been patched in version 0.0.423.
The vulnerability stems from how the CLI's shell safety assessment evaluates commands before execution. The safety layer parses and classifies shell commands as either read-only (safe) or write-capable (requires user approval). However, several bash parameter expansion features can embed executable code within arguments to otherwise read-only commands, causing them to appear safe while actually performing arbitrary operations.
The specific dangerous patterns are ${var
Remediation
Check the references section for vendor advisories and patches from github. Update copilot_command_line_interface to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| github | copilot_command_line_interface | >= 0, < 0.0.423 | Affected |
Frequently Asked Questions
What is CVE-2026-29783?
CVE-2026-29783 is a high-severity vulnerability affecting github copilot_command_line_interface. It was published on March 6, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2026-29783?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-29783?
Check the references section for vendor advisories and patches from github. Update copilot_command_line_interface to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-29783?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-29783 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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