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https://learn.microsoft.com/en-us/dotnet/fundamentals/syslib-diagnostics/syslib0057

SYSLIB0057: X509Certificate2 and X509Certificate constructors for binary and file content are obsolete

Reason for obsoletion

The affected APIs supported loading certificates in multiple formats. For example, new X509Certificate2(data) loaded a certificate from a byte[] called data. data could be one of any supported format, including X.509, PKCS7, or PKCS12/PFX.

While this method was easy to use, it created issues where user-supplied data was passed with a different format than intended. This might allow loading PKCS12 where only X.509 content was intended to be loaded. Or it might create interoperability issues from handling the data in different ways.

https://learn.microsoft.com/en-us/dotnet/fundamentals/syslib-diagnostics/syslib0057

SYSLIB0057: X509Certificate2 and X509Certificate constructors for binary and file content are obsolete

Reason for obsoletion

The affected APIs supported loading certificates in multiple formats. For example, new X509Certificate2(data) loaded a certificate from a byte[] called data. data could be one of any supported format, including X.509, PKCS7, or PKCS12/PFX.

While this method was easy to use, it created issues where user-supplied data was passed with a different format than intended. This might allow loading PKCS12 where only X.509 content was intended to be loaded. Or it might create interoperability issues from handling the data in different ways.
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CLAassistant commented Nov 8, 2025

CLA assistant check
All committers have signed the CLA.

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jit-ci bot commented Nov 8, 2025

Hi, I’m Jit, a friendly security platform designed to help developers build secure applications from day zero with an MVS (Minimal viable security) mindset.

In case there are security findings, they will be communicated to you as a comment inside the PR.

Hope you’ll enjoy using Jit.

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2 participants