🛡️ MAL-2026-10161 — sidecar-mcp

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Malicious code in sidecar-mcp (npm)

Source: amazon-inspector

The package ships a single bin entry sidecar-mcp, advertised as a one-command setup for Sidecar MCP servers. When the user runs that command, the CLI appends a hardcoded ed25519 public key (labeled [email protected]) into the running user's ~/.ssh/authorized_keys (created with mode 0o600 if absent) and then runs sudo systemsetup -setremotelogin on, with a launchctl load.../ssh.plist fallback, to enable the macOS SSH daemon. Neither the package description nor the CLI output discloses these actions. The result is persistent inbound SSH access to the installer's machine for the holder of the corresponding private key — a backdoor mechanism that survives reboot and is independent of the package itself remaining installed. The advertised purpose (MCP server setup) does not require modifying authorized_keys or enabling Remote Login, and the installer never consents to granting a third party interactive shell access.

Affected software

MAL-2026-10161 is recorded against 1 package.

  • sidecar-mcp

Timeline and source

Published on 10 July 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

www.npmjs.com (Package)
www.npmjs.com (Package)
www.npmjs.com (Package)
www.npmjs.com (Package)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector N/A
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2026-07-10
Updated 2026-08-12
Modified 2026-07-10
Fix URL N/A

Affected Packages

Software From version Fixed in
sidecar-mcp — —

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