CVE-2026-87987: Mistralai Mistral-Vibe

Critical severity, CVSS 10.0. EPSS: 0.6% chance of exploitation in the next 30 days.

An arbitrary code execution vulnerability in Mistral Vibe allows an attacker to bypass command permission checks using environment variable assignments preceding allowlisted commands. These assignments are excluded from inspection, enabling attacker-controlled environment variables to cause arbitrary code execution without user approval.

Affected products

• Mistralai Mistral-Vibe: from 2.6.0

Published 2026-09-11. Last modified 2026-09-11.