Sandboxes have become a key security control for AI coding agents, but new research suggests they may not provide the isolation many organizations assume.
Pillar Security has disclosed a series of vulnerabilities showing how agents in tools such as Cursor, Codex, Gemini CLI, and Antigravity can indirectly cross security boundaries without technically escaping their sandboxes.
“In almost every case, the agent did not need to break the sandbox directly,” the researchers said in a blog post. “It only had to write something that a trusted component outside the sandbox would later run, load, scan, or treat as safe.”
The findings outlined four specific and repeatable failure modes in AI sandboxes...