OS command injection in mcp-remote when connecting to untrusted MCP servers

published 2025-07-09 16 mo ago modified 2026-06-17 4 mo ago also GHSA-6xpm-ggf7-wc3p , EUVD-2025-20823

cvss: 9.6; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 77.0%; EPSS 77.0% chance of exploitation in 30 days, percentile 99.5%
public exploits: 0; none known

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

Patch / fix

fixed in 1 links 1

npm mcp-remote 0.1.16

github.com/geelen/mcp-remote@607b226 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 16 mo ago (2025-07-09)

Exploit prediction

77.03% chance of exploitation in the next 30 days, higher than 99.5% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	9.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
GitHub	3.1	9.6	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Affected packages

ecosystem	package	affected	fixed in
npm	mcp-remote	>=0.0.5, <0.1.16	0.1.16

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

github.com /geelen/mcp-remote/commit/607b226a356cb61a239ffaba2fb3db1c9dea4bac
patch, web
research.jfrog.com /vulnerabilities/mcp-remote-command-injection-rce-jfsa-2025-001290844/
third-party-advisory
jfrog.com /blog/2025-6514-critical-mcp-remote-rce-vulnerability
technical-description, web
nvd.nist.gov /vuln/detail/CVE-2025-6514
advisory
github.com /geelen/mcp-remote
package
research.jfrog.com /vulnerabilities/mcp-remote-command-injection-rce-jfsa-2025-001290844
web

Sources

CVE List CVE-2025-6514
GitHub Advisory GHSA-6xpm-ggf7-wc3p
NVD CVE-2025-6514

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary