Wassette

by Microsoft Corporationv0.4.0

Last updated Jun 8, 2026

Wassette: A security-oriented runtime that runs WebAssembly Components via MCP

Install with winget

$ winget install --id Microsoft.Wassette --exact --version 0.4.0

Run in Command Prompt, PowerShell, or Windows Terminal. Prompts for any agreements.

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About

Wassette: A security-oriented runtime that runs WebAssembly Components via MCP

Why Wassette?

- Convenience: Wassette makes it easy to extend AI agents with new tools, all without ever having to leave the chat window.

- Reusability: Wasm Components are generic and reusable; there is nothing MCP-specific about them.

- Security: Wassette is built on the Wasmtime security sandbox, providing browser-grade isolation of tools.

Installers · v0.4.0

Architecture	Type	Scope	Install	Download
x64	ZIP archive	-		Direct
arm64	ZIP archive	-		Direct

Copy a command tailored to that specific architecture, type, and scope - useful when winget would otherwise pick a different default.

Security

1 known CVE via NVD

high8.8Fix in v2.0.0CVE-2026-26118affects before 2.0.0Mar 10, 2026
Server-side request forgery (ssrf) in Azure MCP Server allows an authorized attacker to elevate privileges over a network.
Vendor advisory

Source: NVD, updated 3h ago. Patch status is best-effort: NVD's fix version is compared against the latest version in winget, but the two version formats don't always align. Confirm with the vendor advisory before treating any specific build as safe.

See a CVE that affects your fleet? Push the patched version to Intune in one click with Pckgr.

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Frequently asked questions

How do I install Wassette on Windows?

Open Windows Terminal, PowerShell, or Command Prompt and run: winget install --id Microsoft.Wassette --exact --version 0.4.0. winget downloads the installer from Microsoft Corporation and runs it. Requires Windows 10 (1809+) or Windows 11.

How do I install Wassette silently for unattended deployment?

Add --silent and accept the agreements upfront: winget install --id Microsoft.Wassette --exact 0.4.0 --silent --accept-package-agreements --accept-source-agreements. This is the variant Intune, Configuration Manager, and other deployment tools should use.

How do I uninstall Wassette via winget?

Run: winget uninstall --id Microsoft.Wassette --exact. Add --silent for unattended uninstalls. winget will use the registered uninstaller from Wassette's Apps & Features entry.

Is Wassette free?

Wassette is distributed under MIT. Refer to the publisher (https://github.com/microsoft/wassette) for the full license terms - Wingetly itself does not charge for installation.

Does Wassette work on Windows 10?

Yes, as long as your Windows 10 build supports winget (1809 or newer). winget ships with App Installer on Windows 10/11 and pulls Wassette directly from the publisher.

How do I keep Wassette up to date?

Run winget upgrade --id Microsoft.Wassette --exact, or winget upgrade --all to update everything winget tracks. We index 1 version of Wassette from microsoft/winget-pkgs.