mcp-server-fetch
This report shows the evidence for mcp-server-fetch@0.0.2. 2 of 3 known versions are blocked or flagged. The newest version, 0.0.1-security, is allowed. See all versions.
OpenSSF/OSV Malicious Advisory
imported 4mo ago · by OpenSSF/OSVOpenSSF/OSV advisory MAL-2026-5476 confirms this npm version as malicious.
Advisory
MAL-2026-5476
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in mcp-server-fetch (npm)
Details
Package squats the unscoped name `mcp-server-fetch` (an MCP server name commonly invoked via `npx mcp-server-fetch` by AI coding agents and developer tooling). package.json declares `postinstall: node index.js`, and index.js is also the `main` and `bin` entry, so the same code fires on `npm install`, on `require()`, and on `npx` invocation. index.js line 17 hardcodes `ENDPOINT = 'https://npx-canary-log.vulnerable-live.workers.dev/log'`, and lines 22-28 POST a JSON payload containing `os.hostname()`, `process.cwd()`, the npm user-agent, `process.version`, and `os.platform()` to that endpoint. Errors are silently swallowed. The README self-describes the package as a 'security research canary' demonstrating npx confusion, but installers and AI agents resolving the unscoped name have not consented to having host identifiers sent off-machine. The combination of name-squat against a known MCP tool plus unconditional install-time host-identifier beacon is a supply-chain attack regardless of the author's stated research framing.
References
Source & flagged code
0 flagged · loading sourceNo flagged code excerpts are attached to this scan.
Findings
1 High
HighOsv Malicious Advisory
Affected versions and remediation
This report applies to mcp-server-fetch@0.0.2.
The same advisory and Firewall decision cover 2 recorded versions
0.0.1, 0.0.2
The versions list below shows the verdict for each recorded version.
- Avoid installing mcp-server-fetch@0.0.2. Remove it from direct dependencies and check your lockfile for transitive copies.
- Choose an independently verified alternative or release. This report does not establish that other versions are safe.
- If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.
Evidence last updated: .
Source advisory published: .
This report uses published external intelligence. The advisory does not provide a separate source-code analysis for each listed version.
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