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CVE-2026-59176— Functype: MCP set_functype_version Package Alias RCE via Unsanitized pnpm install + Dynamic Import

Quick assessment

Affected
jordanburke functype
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Functype 是一个 TypeScript 函数式编程库家族。在 1.4.4 版本之前， 中的 MCP 工具在 文件中仅使用 对 字符串进行验证，未施加任何约束，随后将其插值到 中用于执行 命令。攻击者可利用包别名语法（如 、 、URL 或文件路径）诱导系统安装任意本地或远程包，并将其伪装为 functype 包。紧接着， 中的 函数会解析 并动态导入新安装的模块，从而以 MCP 服务器进程的特权执行攻击者控制的 JavaScript 代码。 任何能够发送 请求调用该工具的 MCP 客户端均可利用此漏洞；该工具

CVSS 7.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
jordanburke functype < 1.4.4 affected
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I. Basic Information for CVE-2026-59176

Vulnerability Information
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Vulnerability Title
Functype: MCP set_functype_version Package Alias RCE via Unsanitized pnpm install + Dynamic Import
Source: CVE Program / CVE List V5
Vulnerability Description
Functype is a family of TypeScript functional programming libraries. Prior to 1.4.4, the `set_functype_version` 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@<version>` 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 `TRANSPORT_TYPE=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 `version` 1.4.4.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
从非可信控制范围包含功能例程
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
jordanburke functype < 1.4.4 -

II. Public POCs for CVE-2026-59176

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III. Intelligence Information for CVE-2026-59176

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Patches & Fixes for CVE-2026-59176 (1)

Vendor Advisories for CVE-2026-59176 (1)

Vendor Pages for CVE-2026-59176 (1)

IV. Related Vulnerabilities

Same weakness: CWE-829