CVE-2026-32179: Microsoft.Native.Quic.MsQuic.OpenSSL MsQuic Has A Remote Elevation Vulnerability
CRITICALCVE-2026-32179 is a CRITICAL (CVSS 9.8) msquic has a remote elevation vulnerability (CWE-191: Integer Underflow (Wrap or Wraparound)) affecting Microsoft.Native.Quic.MsQuic.OpenSSL libraries in the NuGet ecosystem. The issue involves msquic has a remote elevation of privilege vulnerability. Remediation is available by upgrading affected packages to version 2.5.7, 2.4.18.
CVE-2026-32179 at a Glance
Security Impact
CVSS: 9.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
How to Fix CVE-2026-32179
To remediate this vulnerability, upgrade all affected Microsoft.Native.Quic.MsQuic.OpenSSL dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade Microsoft.Native.Quic.MsQuic.OpenSSL to 2.5.7Upgrade Microsoft.Native.Quic.MsQuic.Schannel to 2.5.7Upgrade Microsoft.Native.Quic.MsQuic.Schannel to 2.4.18Upgrade Microsoft.Native.Quic.MsQuic.OpenSSL to 2.4.18Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for Microsoft.Native.Quic.MsQuic.OpenSSLHow to Check if You Are Affected
To determine whether your application is affected by CVE-2026-32179, inspect your project dependencies for Microsoft.Native.Quic.MsQuic.OpenSSL:
inspect dependencies for Microsoft.Native.Quic.MsQuic.OpenSSLAnalyze the terminal output to locate any version of Microsoft.Native.Quic.MsQuic.OpenSSL in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.5.7), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-191: Integer Underflow (Wrap or Wraparound), where the product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. In Microsoft.Native.Quic.MsQuic.OpenSSL, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-32179 Affected Microsoft.Native.Quic.MsQuic.OpenSSL Versions
4 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
Microsoft.Native.Quic.MsQuic.OpenSSL
|
NuGet |
≥ 2.5.0-ci.532574
< 2.5.7
|
2.5.7
|
|
Microsoft.Native.Quic.MsQuic.Schannel
|
NuGet |
≥ 2.5.0-ci.532574
< 2.5.7
|
2.5.7
|
|
Microsoft.Native.Quic.MsQuic.Schannel
|
NuGet |
< 2.4.18
|
2.4.18
|
|
Microsoft.Native.Quic.MsQuic.OpenSSL
|
NuGet |
< 2.4.18
|
2.4.18
|
References
Frequently Asked Questions
What is CVE-2026-32179?
Which Microsoft.Native.Quic.MsQuic.OpenSSL versions are affected?
What version fixes CVE-2026-32179?
Is Microsoft.Native.Quic.MsQuic.OpenSSL affected?
Is Microsoft.Native.Quic.MsQuic.Schannel affected?
What is the CVSS score of CVE-2026-32179?
What CWE is associated with CVE-2026-32179?
How can I check NuGet dependencies for CVE-2026-32179?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-gvvw-8j96-8g5r",
"modified" : "2026-05-08T15:19:44Z",
"published" : "2026-04-16T01:04:03Z",
"aliases" : [ "CVE-2026-32179" ],
"summary" : "MsQuic has a Remote Elevation of Privilege Vulnerability",
"details" : "### Summary\nImproper input validation in Microsoft QUIC allows an unauthorized attacker to elevate privileges over a network.\n\n### Details\n Improper Input Validation Integer Underflow (Wrap or Wraparound) when decoding ACK frame.\n\n#### Patches\n- Fix underflow in ACK frame parsing - 1e6e999b\n\n### Impact\nAn attacker who successfully exploited this vulnerability could gain elevated privileges.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.Native.Quic.MsQuic.OpenSSL"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.5.0-ci.532574"
}, {
"fixed" : "2.5.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.Native.Quic.MsQuic.Schannel"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "2.5.0-ci.532574"
}, {
"fixed" : "2.5.7"
} ]
} ]
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.Native.Quic.MsQuic.Schannel"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.4.18"
} ]
} ]
}, {
"package" : {
"ecosystem" : "NuGet",
"name" : "Microsoft.Native.Quic.MsQuic.OpenSSL"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "2.4.18"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/microsoft/msquic/security/advisories/GHSA-gvvw-8j96-8g5r"
}, {
"type" : "WEB",
"url" : "https://github.com/microsoft/msquic/commit/1e6e999b199430effeefee3d85baa0c9dd35ad5e"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/microsoft/msquic"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-191" ],
"severity" : "CRITICAL",
"github_reviewed" : true,
"github_reviewed_at" : "2026-04-16T01:04:03Z",
"nvd_published_at" : null
}
}