VulnerabilityDeferred

CVE-2026-87986

An arbitrary code execution vulnerability in Mistral Vibe allows an attacker to bypass command permission checks using shell constructs it's parser cannot interpret.

CRITICAL 10.0EPSS 0.44%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.44%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

An arbitrary code execution vulnerability in Mistral Vibe allows an attacker to bypass command permission checks using shell constructs it's parser cannot interpret. Unparsed portions are omitted from inspection, enabling embedded commands to execute on the user's system without approval.

CVSS 4.0: 10.0 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.44% probability · 37th percentile
CISA KEV: Not listed
Weakness: CWE-228
Source: 6f8de1f0-f67e-45a6-b68f-98777fdb759c

References

https://www.hiddenlayer.com/sai-security-advisory/2026-09-mistral-vibe4

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.