Use-after-free in Microsoft products - CVE-2026-85790

Vulnerability details

The vulnerability allows a remote attacker to disclose heap memory from a privileged process running on the server.

The vulnerability exists due to use-after-free in Microsoft QUIC when handling network communications. A remote attacker can exploit the flaw over a network to disclose heap memory from a privileged process running on the server.

Successful exploitation requires a deep understanding of the system and depends on factors such as the environment, system configuration, and additional security measures.

Affected software

How to mitigate CVE-2026-85790

External References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2026-85790
• https://www.nuget.org/packages/Microsoft.Native.Quic.MsQuic.Schannel

Related Security Bulletins

• Multiple vulnerabilities in Microsoft Windows