user@runtime:~/blog$ grep -l "system-net-mail" posts/*.md

system-net-mail

1 post tagged with system-net-mail.

2026-04-18 8m

.NET April 2026 Security Patches: SMTP Header Injection and XML Recursion Bombs Explained

Microsoft's April 2026 servicing update patches two high-severity vulnerabilities in System.Net.Mail and System.Security.Cryptography.Xml. Here is how they work, why they matter, and what you need to do.