EXECUTIVE SUMMARY:
CVE-2026-32179 with a CVSS score of 9.8 is a Critical Remote Elevation of Privilege Vulnerability in Microsoft QUIC, affecting versions of nuget/Microsoft.Native.Quic.MsQuic.OpenSSL greater than or equal to 2.5.0-ci.532574, less than 2.5.7, and versions of nuget/Microsoft.Native.Quic.MsQuic.Schannel greater than or equal to 2.5.0-ci.532574, less than 2.5.7, as well as versions of nuget/Microsoft.Native.Quic.MsQuic.OpenSSL and nuget/Microsoft.Native.Quic.MsQuic.Schannel less than 2.4.18. This vulnerability arises from improper input validation, specifically an integer underflow in the decoding of ACK frames, which allows an unauthorized attacker to elevate privileges over a network by exploiting a wrap or wraparound condition. An attacker can exploit this vulnerability by sending a malicious ACK frame to a vulnerable system, requiring remote access to the affected system. Successful exploitation yields elevated privileges, enabling the attacker to potentially perform unauthorized actions and access sensitive data. The business impact and consequences of a successful attack could be severe, including unauthorized access to sensitive data, disruption of critical systems, and compromise of sensitive credentials.[/subscribe_to_unlock_form]
EXECUTIVE SUMMARY:
CVE-2026-32179 with a CVSS score of 9.8 is a Critical Remote Elevation of Privilege Vulnerability in Microsoft QUIC, affecting versions of nuget/Microsoft.Native.Quic.MsQuic.OpenSSL greater than or equal to 2.5.0-ci.532574, less than 2.5.7, and versions of nuget/Microsoft.Native.Quic.MsQuic.Schannel greater than or equal to 2.5.0-ci.532574, less than 2.5.7, as well as versions of nuget/Microsoft.Native.Quic.MsQuic.OpenSSL and nuget/Microsoft.Native.Quic.MsQuic.Schannel less than 2.4.18. This vulnerability arises from improper input validation, specifically an integer underflow in the decoding of ACK frames, which allows an unauthorized attacker to elevate privileges over a network by exploiting a wrap or wraparound condition. An attacker can exploit this vulnerability by sending a malicious ACK frame to a vulnerable system, requiring remote access to the affected system. Successful exploitation yields elevated privileges, enabling the attacker to potentially perform unauthorized actions and access sensitive data. The business impact and consequences of a successful attack could be severe, including unauthorized access to sensitive data, disruption of critical systems, and compromise of sensitive credentials.[emaillocker id="1283"]
RECOMMENDATION:
We recommend you to update package nuget/Microsoft.Native.Quic.MsQuic.OpenSSL to version 2.5.7 and nuget/Microsoft.Native.Quic.MsQuic.Schannel to version 2.5.7 or 2.4.18.
REFERENCES:
The following
reports contain further technical details:
https://github.com/advisories/GHSA-gvvw-8j96-8g5r