Is there a public exploit for CVE-2026-59176?

No public exploit for CVE-2026-59176 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-59176?

CVE-2026-59176 scores CVSS 7.8 (v3.1), rated high.

7.8 High

Functype is a family of TypeScript functional programming libraries.

CVE-2026-59176

Functype is a family of TypeScript functional programming libraries. Prior to 1.4.4, the setfunctypeversion MCP tool in functype-mcp-server accepts an unconstrained version string using only z.string() validation in packages/mcp-server/src/index.ts and interpolates it into functype@ for pnpm add. Package-alias syntaxes such as file:, npm:, URLs, or paths can cause an arbitrary local or remote package to be installed as functype. Immediately afterward, initDocsData(true) in packages/mcp-server/src/lib/docs/data.ts resolves functype/cli and dynamically imports the newly installed module, executing attacker-controlled JavaScript with the MCP server process's privileges. Any MCP client able to send a tools/call request invoking the tool can exploit the flaw; the tool is enabled by default without authentication in stdio mode. A connected AI assistant susceptible to indirect prompt injection can also be induced to invoke it from a malicious document or web page. In non-default TRANSPORTTYPE=httpStream deployments, a network-accessible attacker does not require local access. Successful execution can read process secrets, modify files, or terminate the server. This issue is fixed in…

Part of the AI stack

This affects Model Context Protocol, in MCP & tool servers.

Assessment

CVSS: 7.8 (v3.1)
Severity: High
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 3 November 2026
Weakness: CWE-829
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

At the source

References

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