Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control (CVE-2026-86121) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-86121

Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control

Answer in brief

CVE-2026-86121 records a Unknown severity vulnerability in Cua computer-server before 0.3.42 Unauthenticated RCE via Desktop Control. The current sources do not mark it as known exploited. The current feed maps trycua/cua-computer-server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 5, 2026Updated Sep 5, 2026Source checked Sep 6, 2026First seen by HOL Sep 5, 2026Material review Sep 5, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps trycua/cua-computer-server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
trycua/cua-computer-servergeneric	>=0 <0.3.42	0.3.42

Recommended response

Check inventory. Check lockfiles and deployed manifests for trycua/cua-computer-server.
Review the reported fix. Update trycua/cua-computer-server to 0.3.42 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.