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CVE

CVE-2026-32179

MsQuic has a Remote Elevation of Privilege Vulnerability
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CVE

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.

MSRC CVE Info

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32179

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
-
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://github.com/microsoft/msquic/security/advisories/GHSA-gvvw-8j96-8g5r, https://github.com/microsoft/msquic/commit/1e6e999b199430effeefee3d85baa0c9dd35ad5e, https://github.com/microsoft/msquic

Severity

9.8

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
9.8
EPSS Probability
0%
EPSS Percentile
0%
Introduced Version
2.5.0-ci.532574,0
Fix Available
2.5.7,2.4.18

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