{"id":"CVE-2026-109429","published":"2026-10-13T19:18:33.250","lastModified":"2026-10-16T23:16:58.633","description":"Mistral Vibe before 2.25.4 contains a command permission gate bypass vulnerability that allows attackers to execute arbitrary commands by hiding a command substitution inside a single-quoted variable value that tree-sitter-bash static parsing cannot detect. Attackers can craft input such as embedding a command substitution within a single-quoted variable and re-expanding it with the ${var@P} prompt-transform operator so bash's promptvars feature executes the hidden command at runtime while only the trailing allowlisted command is classified, resulting in silent arbitrary command execution with the privileges of the agent's terminal session.","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","cwes":["CWE-436"],"vendors":[],"products":[],"references":[{"url":"https://github.com/mistralai/mistral-vibe/commit/19b5b74faa78d0816b8d4d4c7d7543fc3520678c","tags":[]},{"url":"https://github.com/mistralai/mistral-vibe/pull/1084","tags":[]},{"url":"https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.4","tags":[]},{"url":"https://www.vulncheck.com/advisories/mistral-vibe-bash-permission-bypass-via-var-p-prompt-transform","tags":[]}],"exploitRefs":[{"url":"https://github.com/mistralai/mistral-vibe/commit/19b5b74faa78d0816b8d4d4c7d7543fc3520678c","tags":[]},{"url":"https://github.com/mistralai/mistral-vibe/pull/1084","tags":[]},{"url":"https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.4","tags":[]}],"hasPoc":true,"ai":{"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.","remediation":"Upgrade to Mistral Vibe 2.25.4 or later to address this command permission gate bypass vulnerability.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","command-injection","bash","permission-bypass"],"model":"garnet-coder","analyzedAt":"2026-10-17T08:55:39.317Z"}}