Microsoft Security Advisory CVE-2026-85790 - .NET Information Disclosure Vulnerability

[ Description ]Official description

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

[ Fixes ]Fixes and patches

• Microsoft.Native.Quic.MsQuic.Schannel 2.5.12Fixed version · GitHub Advisories · nuget package Microsoft.Native.Quic.MsQuic.Schannel: upgrade to 2.5.12 or later (affected >= 1.9.0, < 2.5.12)
• Microsoft.Native.Quic.MsQuic.Schannel 2.6.3Fixed version · GitHub Advisories · nuget package Microsoft.Native.Quic.MsQuic.Schannel: upgrade to 2.6.3 or later (affected >= 2.6.0, < 2.6.3)
• Patch on msrc.microsoft.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Advisories ]Government CERT advisories

• CERT-FR14 Oct 2026CERTFR-2026-AVI-1316

  Multiple vulnerabilities in Microsoft products Translated from French

  Multiple vulnerabilities have been discovered in Microsoft products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-88086CVE-2026-70007CVE-2026-70179+141 more CVEs
• CERT-FR14 Oct 2026CERTFR-2026-AVI-1314

  Multiple vulnerabilities in Microsoft Windows Translated from French

  Multiple vulnerabilities have been discovered in Microsoft Windows. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service. Microsoft reports that…

  CVE-2026-70096CVE-2026-100200CVE-2026-100201+1118 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3893

  Microsoft Entwicklerwerkzeuge: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-96230CVE-2026-84008CVE-2026-102238+64 more CVEs
• BSI CERT-Bund13 Oct 2026WID-SEC-2026-3892

  Microsoft Windows and Windows Server: Multiple vulnerabilities Translated from German

  CVE-2026-69968CVE-2026-83785CVE-2026-72968+1124 more CVEs

[ Packages ]Affected open-source packages

• Microsoft.Native.Quic.MsQuic.Schannel nugetAffected >= 1.9.0, < 2.5.12 · fixed in 2.5.12 · GHSA-2mxg-prvg-9jfg
• Microsoft.Native.Quic.MsQuic.Schannel nugetAffected >= 2.6.0, < 2.6.3 · fixed in 2.6.3 · GHSA-2mxg-prvg-9jfg

[ References ]References

• msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85790PatchVendor Advisory