Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck
CVE-2026-109428Mistral Vibe < 2.25.5 Permission Bypass via Bash Line Continuation
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 0.5% (higher than 44% of all known vulnerabilities).
Official description
Mistral Vibe before 2.25.5 contains a permission validation bypass vulnerability that allows attackers to execute unauthorized commands by exploiting a parsing discrepancy between tree-sitter-bash and bash in handling backslash-newline line continuations in the _extract_commands() function of bash.py. Attackers can craft a command string where tree-sitter-bash extracts only an allowlisted prefix such as cd while bash joins the line continuation into a materially different and hidden command such as a curl request, causing resolve_permission to grant ALWAYS permission while bash executes unauthorized arbitrary commands.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mistralai | mistral-vibe | 0 – before 2.25.5 |
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
- Pull Request issue-tracking, patch
- Patch Commit patch, issue-tracking
- VulnCheck Advisory: Mistral Vibe < 2.25.5 Permission Bypass via Bash Line Continuation third-party-advisory