CVE-2026-70197: Microsoft Security Advisory CVE-2026-70197 - .NET and Visual Studio Remote Code Execution Vulnerability
(updated )
Microsoft is releasing this security advisory to provide information about a vulnerability in System.Net.Sockets. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.
On Windows, reusing a SocketAsyncEventArgs instance across IPv4 and IPv6 datagram sockets can retain an undersized cached native address buffer, allowing an unauthenticated out-of-bounds write during ReceiveFromAsync.
References
- github.com/advisories/GHSA-4mpw-cpwj-hxxj
- github.com/dotnet/announcements/issues/466
- github.com/dotnet/announcements/issues/493
- github.com/dotnet/runtime/issues/135702
- github.com/dotnet/runtime/issues/136445
- github.com/dotnet/runtime/security/advisories/GHSA-4mpw-cpwj-hxxj
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70197
- nvd.nist.gov/vuln/detail/CVE-2026-70197
Code Behaviors & Features
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