CVE-2026-62909: Microsoft Security Advisory CVE-2026-62909 – .NET Elevation of Privilege Vulnerability

August 11, 2026

Microsoft is releasing this security advisory to provide information about a vulnerability in .NET diagnostics IPC. This advisory also provides guidance on what developers can do to update their applications to remove this vulnerability.

A missing error check in .NET causes an improper ACL to be applied to a shared resource, resulting in local elevation of privilege.

References

github.com/advisories/GHSA-9mr8-pwpw-3j2w
github.com/dotnet/announcements/issues/429
github.com/dotnet/runtime/security/advisories/GHSA-9mr8-pwpw-3j2w
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-62909
nvd.nist.gov/vuln/detail/CVE-2026-62909

Code Behaviors & Features

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