What’s Vulnerable › Vulnerabilities

CVE-2026-86121: Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-05 · updated 2026-09-24
• Weakness: CWE-306

Description

Cua computer-server versions before 0.3.42 skip authentication when the CONTAINER_NAME environment variable is unset and bind to all interfaces by default, allowing unauthenticated attackers to execute arbitrary commands. Attackers can reach TCP port 8000 to run shell commands via the run_command endpoint, read and write arbitrary files through file operation endpoints, and access interactive PTY shells without authentication.

Affected products

• trycua cua-computer-server: before 0.3.42 — fixed in 0.3.42

How to fix

Upgrade to a fixed version: trycua cua-computer-server 0.3.42. Check the vendor advisory for mitigations.

References

• https://github.com/trycua/cua
• https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/cli.py
• https://github.com/trycua/cua/blob/10a2e71792db/libs/python/computer-server/computer_server/main.py
• https://github.com/trycua/cua/commit/59cf25c0ec54
• https://github.com/trycua/cua/issues/1892
• https://www.vulncheck.com/advisories/cua-computer-server-before-0.3.42-unauthenticated-rce-via-desktop-control
• https://github.com/trycua/cua/issues/1892

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