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mcp-remote exposed to OS command injection via untrusted MCP server connections

Critical severity GitHub Reviewed Published Jul 9, 2025 to the GitHub Advisory Database • Updated Jul 9, 2025

Package

npm mcp-remote (npm)

Affected versions

>= 0.0.5, < 0.1.16

Patched versions

0.1.16

Description

mcp-remote is exposed to OS command injection when connecting to untrusted MCP servers due to crafted input from the authorization_endpoint response URL

References

Published by the National Vulnerability Database Jul 9, 2025
Published to the GitHub Advisory Database Jul 9, 2025
Reviewed Jul 9, 2025
Last updated Jul 9, 2025

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(28th percentile)

Weaknesses

CVE ID

CVE-2025-6514

GHSA ID

GHSA-6xpm-ggf7-wc3p

Source code

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