CVE-2026-62898: Microsoft Security Advisory CVE-2026-62898 – .NET Information Disclosure Vulnerability

August 11, 2026

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

A use after free in Microsoft QUIC allows an unauthorized attacker to disclose information over a network.

References

github.com/advisories/GHSA-c494-m2fq-59mx
github.com/dotnet/announcements/issues/426
github.com/dotnet/runtime/security/advisories/GHSA-c494-m2fq-59mx
nvd.nist.gov/vuln/detail/CVE-2026-62898

Code Behaviors & Features

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