Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck
CVE-2026-109429Mistral Vibe < 2.25.4 Bash Permission Bypass via ${var@P} Prompt-Transform
High 8.8
In plain English
A high-severity security flaw in mistral-vibe from mistralai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mistralai | mistral-vibe | 0 – before 2.25.4 |
Weakness: CWE-436 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
References
- Release Notes release-notes, patch
- Pull Request issue-tracking, patch
- Patch Commit patch, issue-tracking
- VulnCheck Advisory: Mistral Vibe < 2.25.4 Bash Permission Bypass via ${var@P} Prompt-Transform third-party-advisory