CRITICAL

CVE-2026-55176

CVSS v3

CRITICAL

EPSS Score

0.3 %

exploit probability, as of 2026-10-01

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

Soft Machine is a Virtual Machine–based agentic development environment / Cloud OS. In versions 0.2.247 and prior, two authentication helpers in /app/server.js — verifyContainerAuth() and authenticateWorkspaceHttp() — accept the global CONTAINER_SHARED_SECRET as a bearer token without verifying which workspace the caller belongs to. Because that secret is set identically on every container in the Fly app and is reachable from the user-facing process environment inside each workspace, any tenant

Technical details

CVSS v3 Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Published: 2026-09-30
Last Modified: 2026-09-30

Frequently asked questions

What is CVE-2026-55176?

Is CVE-2026-55176 actively exploited?

Active exploitation of CVE-2026-55176 has not been confirmed. Its EPSS score was 0.3% on 2026-10-01, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-55176?

CVE-2026-55176 has a CVSS v3 base score of 9 (CRITICAL severity), with vector string CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

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