CVE-2026-109428: Interpretation Conflict in mistralai mistral-vibe
Description
Mistral Vibe versions before 2.25.5 have a permission validation bypass vulnerability in the _extract_commands() function of bash.py. This flaw arises from a parsing discrepancy between tree-sitter-bash and bash when handling backslash-newline line continuations. An attacker can craft a command string that appears safe to the permission resolver but executes unauthorized commands in bash, potentially leading to arbitrary command execution.
CVSS v4.0
Score 8.7high
Affected software
mistralai
mistral-vibe
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-109428 describes a permission validation bypass in mistral-vibe prior to version 2.25.5. The vulnerability is due to inconsistent parsing of backslash-newline line continuations between tree-sitter-bash and bash within the _extract_commands() function in bash.py. Specifically, tree-sitter-bash extracts only an allowlisted prefix (e.g., 'cd'), causing resolve_permission to grant permission, while bash concatenates the line continuation into a different hidden command (e.g., a curl request). This discrepancy allows attackers to execute unauthorized arbitrary commands.
Potential Impact
Exploitation of this vulnerability can lead to unauthorized command execution with permissions granted by resolve_permission, bypassing intended permission checks. This could allow attackers to perform arbitrary actions on affected systems, potentially compromising system integrity and confidentiality.
Mitigation Recommendations
A fix is available in mistral-vibe version 2.25.5. Users should upgrade to version 2.25.5 or later to remediate this vulnerability. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-12T15:52:36.682Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ace79b72cdf04f656972470
Added to database: 10/13/2026, 18:34:31 UTC
Last enriched: 10/13/2026, 18:50:37 UTC
Last updated: 10/13/2026, 18:57:33 UTC
Views: 7
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