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CVE-2026-59176high7.8

Functype: MCP set_functype_version Package Alias RCE via Unsanitized pnpm install + Dynamic Import

Impact

Functype versions prior to 1.4.4 are affected by a vulnerability where an attacker with access to send a `tools/call` request can execute arbitrary JavaScript. The weakness is due to unsanitized input in the `set_functype_version` tool. This can lead to reading process secrets, modifying files, or terminating the server.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.
Applies when

In non-default TRANSPORT_TYPE=httpStream deployments, a network-accessible attacker does not require local access.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

jordanburke · GitHub_M

functype

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

< 1.4.4

unaffected

unknown

Other versions: unknown

Original source 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.

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-59176

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-829 ↗

CWE-829: Inclusion of Functionality from Untrusted Control Sphere

GitHub_M

Related →
Contributing organizations · 1
GitHub_M

Assigning organization

2026-10-28

What changed

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References

3 sources
github.com/jordanburke/functype/security/advisories/GHSA-wcjj-9m6g-2fr2
Security advisoryGitHub_M
github.com/jordanburke/functype/commit/c0d58ad9c2a7d15c6117bd3adbbd75de37317dcf
PatchGitHub_M
github.com/jordanburke/functype/releases/tag/v1.4.4
Release notesGitHub_M