CVE-2026-32179
CRITICAL9.8MsQuic has a Remote Elevation of Privilege Vulnerability
Published: 4/16/2026Modified: 5/8/2026
Description
### 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 packages (2)
- NuGet/Microsoft.Native.Quic.MsQuic.OpenSSL>= 2.5.0-ci.532574, < 2.5.7
- NuGet/Microsoft.Native.Quic.MsQuic.Schannel>= 2.5.0-ci.532574, < 2.5.7
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |