CVE-2026-32178: .NET Spoofing Vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-14 · updated 2026-10-26
Weakness: CWE-138

Description

Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

Affected products

Microsoft .NET: from 10.0.0 before 10.0.6; from 8.0.0 before 8.0.26; from 9.0.0 before 9.0.15 — fixed in 10.0.6, 8.0.26, 9.0.15
Microsoft Visual Studio 2022 version 17.14: from 17.12.0 before 17.12.19; from 17.14.0 before 17.14.30 — fixed in 17.12.19, 17.14.30
Microsoft .NET: from 10.0.0 before 10.0.6 — fixed in 10.0.6
Microsoft .NET 8.0: from 8.0 before 8.0.26 — fixed in 8.0.26
Microsoft .NET 9.0: from 9.0.0 before 9.0.15 — fixed in 9.0.15
Microsoft Visual Studio 2022 version 17.14: from 17.12.0 before 17.12.19 — fixed in 17.12.19

How to fix

Upgrade to a fixed version: Microsoft .NET 10.0.6, 8.0.26, 9.0.15; Microsoft Visual Studio 2022 version 17.14 17.12.19, 17.14.30; Microsoft .NET 10.0.6; Microsoft .NET 8.0 8.0.26; Microsoft .NET 9.0 9.0.15; Microsoft Visual Studio 2022 version 17.14 17.12.19. Check the vendor advisory for mitigations.

References

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