SymCrypt

by Microsoftv103.8.0

Last updated Jun 8, 2026

Unit test program for the core cryptographic function library currently used by Windows.

Install with winget

$ winget install --id Microsoft.SymCryptUnitTest --exact --version 103.8.0

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

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Installers · v103.8.0

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

medium6.1Fix in v103.11.0CVE-2026-35199affects before 103.11.0Apr 6, 2026
SymCrypt is the core cryptographic function library currently used by Windows. From 103.5.0 to before 103.11.0, The SymCryptXmssSign function passes a 64-bit leaf count value to a helper function that accepts a 32-bit parameter. For XMSS^MT parameter sets with total tree height...
Vendor advisory

Source: NVD, updated just now. 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 SymCrypt on Windows?

Open Windows Terminal, PowerShell, or Command Prompt and run: winget install --id Microsoft.SymCryptUnitTest --exact --version 103.8.0. winget downloads the installer from Microsoft and runs it. Requires Windows 10 (1809+) or Windows 11.

How do I install SymCrypt silently for unattended deployment?

Add --silent and accept the agreements upfront: winget install --id Microsoft.SymCryptUnitTest --exact 103.8.0 --silent --accept-package-agreements --accept-source-agreements. This is the variant Intune, Configuration Manager, and other deployment tools should use.

How do I uninstall SymCrypt via winget?

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

Is SymCrypt free?

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

Does SymCrypt 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 SymCrypt directly from the publisher.

How do I keep SymCrypt up to date?

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