Vulnerability · Published Sep 11, 2026 · Assigned by HiddenLayer

CVE-2026-87987

Critical 10.0

In plain English

A critical-severity security flaw in mistral-vibe from mistralai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 47% of all known vulnerabilities).

Severity (CVSS 4.0)10.0Critical

Exploit odds (30 days)0.6%top 53.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
mistralai	mistral-vibe	2.6.0 – through *

Weakness: CWE-15 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

https://www.hiddenlayer.com/sai-security-advisory/2026-09-mistral-vibe5