CVE-2026-109428

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.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

13 Oct 2026, 19:18

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-13 19:18

Updated : 2026-10-26 20:17

NVD link : CVE-2026-109428

Mitre link : CVE-2026-109428

CVE.ORG link : CVE-2026-109428

JSON object : View

Products Affected

No product.

CWE

CWE-436

Interpretation Conflict

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