---
id: CVE-2026-109428
title: >-
  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 l…
summary: >-
  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 l…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-436
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T19:30:29.797'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-109428'
references:
  - url: >-
      https://github.com/mistralai/mistral-vibe/commit/c069ffa1e12fb5f2487b489217c40ab97721d553
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mistralai/mistral-vibe/pull/1111'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.5'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/mistral-vibe-permission-bypass-via-bash-line-continuation
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:28.931Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.