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

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

https://cvefeed.io/rssfeed/latest.atom / Wed, 10/28/2026 - 19:12
CVE ID :CVE-2026-59176
Published : Oct. 28, 2026, 2:17 p.m. | 2 hours, 6 minutes ago
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@` 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.
Severity: 7.8 | HIGH
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