What’s Vulnerable › Vulnerabilities

CVE-2026-109428: Mistral Vibe < 2.25.5 Permission Bypass via Bash Line Continuation

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-13 · updated 2026-10-26
• Weakness: CWE-436

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

• mistralai mistral-vibe: before 2.25.5 — fixed in 2.25.5

How to fix

Upgrade to a fixed version: mistralai mistral-vibe 2.25.5. Check the vendor advisory for mitigations.

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

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