CVE-2026-32179
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
What each source reports
GitHub Advisories Score usedGHSA-gvvw-8j96-8g5r
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.
- Record
GHSA-gvvw-8j96-8g5r- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
OSVGHSA-gvvw-8j96-8g5r
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.
- Record
GHSA-gvvw-8j96-8g5r- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-191
- Updated
- 2026-11-02
Affected packages
| Package | Affected | Fixed |
|---|---|---|
Microsoft.Native.Quic.MsQuic.OpenSSLNuGet |
2.5.0-ci.532574 up to 2.5.7 | 2.5.7 |
Microsoft.Native.Quic.MsQuic.SchannelNuGet |
2.5.0-ci.532574 up to 2.5.7 | 2.5.7 |
Microsoft.Native.Quic.MsQuic.SchannelNuGet |
before 2.4.18 | 2.4.18 |
Microsoft.Native.Quic.MsQuic.OpenSSLNuGet |
before 2.4.18 | 2.4.18 |
Microsoft.Native.Quic.MsQuic.SchannelNuGet |
before 2.4.18, plus listed versions 1.8.0 |
2.4.18 |
Microsoft.Native.Quic.MsQuic.OpenSSLNuGet |
before 2.4.18, plus listed versions 1.8.0 |
2.4.18 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | GitHub Advisories, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-32179 is a critical vulnerability (CVSS 9.8) in Microsoft.Native.Quic.MsQuic.OpenSSL, published April 16, 2026. No source lists public exploit code. Fixed in Microsoft.Native.Quic.MsQuic.OpenSSL 2.5.7.