MsQuic has a Remote Elevation of Privilege Vulnerability
Summary
Improper input validation in Microsoft QUIC allows an unauthorized attacker to elevate privileges over a network.
Details
Improper Input Validation Integer Underflow (Wrap or Wraparound) when decoding ACK frame.
Patches
- Fix underflow in ACK frame parsing - 1e6e999b
Impact
An attacker who successfully exploited this vulnerability could gain elevated privileges.
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | Microsoft.Native.Quic.MsQuic.OpenSSL | >= 2.5.0-ci.532574, < 2.5.7, < 2.4.18 | 2.5.7, 2.4.18 |
| .NET (NuGet) | Microsoft.Native.Quic.MsQuic.Schannel | >= 2.5.0-ci.532574, < 2.5.7, < 2.4.18 | 2.5.7, 2.4.18 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-191- Platform
- .NET (NuGet)
- Package
Microsoft.Native.Quic.MsQuic.OpenSSL, Microsoft.Native.Quic.MsQuic.Schannel- Disclosed
- 16.04.2026
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gvvw-8j96-8g5r - CC BY 4.0
Vulnerability history: Microsoft.Native.Quic.MsQuic.OpenSSL
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 10.2023 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 3
Disclosures per year
- 2023: 2
- 2024: 1
- 2025: 0
- 2026: 3
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MsQuic has a Remote Elevation of Privilege Vulnerability this entry
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