Mistral Vibe before 2.25.5 contains a permission validation bypass vulnerability that allows…

Why it is Amber

• CVSS 8.8 high
• Remotely exploitable without logging in

References

• https://github.com/mistralai/mistral-vibe/commit/c069ffa1e12fb5f2487b489217c40ab97721d553
• https://github.com/mistralai/mistral-vibe/pull/1111
• https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.5
• https://www.vulncheck.com/advisories/mistral-vibe-permission-bypass-via-bash-line-continuation

Original 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.