{"id":"CVE-2026-59176","revision":"38f20b4d43114919919c8284abe51b08","records":[{"revision":"38f20b4d43114919919c8284abe51b08","observedAt":"2026-10-28T14:46:48.769+00:00","statement":{"source":"cve-program","id":"CVE-2026-59176","aliases":[],"title":"Functype: MCP set_functype_version Package Alias RCE via Unsanitized pnpm install + Dynamic Import","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.","state":0,"publishedAt":"2026-10-28T13:08:52.592+00:00","modifiedAt":"2026-10-28T13:08:52.592+00:00","affected":[{"ecosystem":"Vendor product","name":"functype","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"jordanburke\",\n                    \"product\": \"functype\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.4.4\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://github.com/jordanburke/functype/security/advisories/GHSA-wcjj-9m6g-2fr2","https://github.com/jordanburke/functype/commit/c0d58ad9c2a7d15c6117bd3adbbd75de37317dcf","https://github.com/jordanburke/functype/releases/tag/v1.4.4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-59176","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-59176","identifiers":["CVE-2026-59176"]},"retained":false,"historicalAffected":[]}],"coverage":[]}