CVE-2026-109429

Summary

This vulnerability allows attackers to bypass command permission gates by hiding command substitutions within single-quoted variable values, which static parsing tools like tree-sitter-bash fail to detect. The flaw leverages bash's promptvars feature with the ${var@P} operator to execute hidden commands at runtime, enabling silent arbitrary command execution with agent privileges.

Exploitability

Exploitation is moderately difficult requiring attackers to craft specific input that embeds command substitutions within single-quoted variables and then re-expands them using bash's promptvars feature, but requires no user interaction beyond submitting the crafted input.

Blast radius

The impact could be significant as attackers could execute arbitrary commands with the privileges of the agent's terminal session, potentially leading to full system compromise or lateral movement within the affected environment.

Detection

No reliable host or network indicator is derivable from the published description.

Prioritized remediation

Upgrade to Mistral Vibe 2.25.4 or later to address this command permission gate bypass vulnerability.

Analysis generated locally by garnet-coder (no data left the box). AI-assisted — verify against primary sources before acting.