What is CVE-2026-29783?

CVE-2026-29783 is a high-severity vulnerability in Github Copilot-cli, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-03-06.

How severe is CVE-2026-29783?

High severity. CVSS v3 base score is 7.8 out of 10.

RCE in Github Copilot-cli

CVE-2026-29783

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…

Vulnerability class: Command Injection (OS Command Injection)

EPSS: 0.001 (20.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Github Copilot-cli — versions <= 0.0.422
Github Copilot_command_line_interface

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-29783?: CVE-2026-29783 is a high-severity vulnerability in Github Copilot-cli, classified under OS Command Injection. CVSS score: 7.8/10. Published 2026-03-06.
How severe is CVE-2026-29783?: High severity. CVSS v3 base score is 7.8 out of 10.