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Sunday, 13 September 2026
8 agent hacks today▲ 7 vs yesterday (1)
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Incident database

GitHub Copilot CLI shell tool bypass allows arbitrary code execution (CVE-2026-29783)

GitHub Copilot CLI versions up to and including 0.0.422 contained a flaw where crafted bash parameter expansion patterns could hide executable code inside commands classified as read-only by the safety layer, enabling arbitrary code execution on a user's workstation via prompt injection through repository files, MCP server responses or user instructions. The issue was patched in version 0.0.423.

Disclosed 6 March 2026 · Record updated 13 September 2026

Impact

Attackers able to influence agent commands could bypass the read-only command safety assessment to execute arbitrary code, potentially leading to data exfiltration, file modification or further system compromise.

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-29783