What’s Vulnerable › Vulnerabilities

CVE-2026-32177: .NET Elevation of Privilege Vulnerability

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-08-10
• Weakness: CWE-122

Description

Heap-based buffer overflow in .NET allows an unauthorized attacker to elevate privileges locally.

Affected products

• Microsoft .NET: from 8.0.0 before 8.0.27; from 9.0.0 before 9.0.16; from 10.0.0 before 10.0.8 — fixed in 10.0.8, 8.0.27, 9.0.16
• Microsoft .NET Framework: 4.8, 4.6.2, 4.7, 4.7.1, 4.7.2, 3.5 (+1)
• Microsoft Visual Studio 2022 version 17.14: from 17.12.0 before 17.12.20; from 17.14.0 before 17.14.32 — fixed in 17.12.20, 17.14.32
• Microsoft Visual Studio 2026 version 18.9: from 18.5.0 before 18.5.3 — fixed in 18.5.3
• Microsoft .NET: from 10.0.0 before 10.0.8 — fixed in 10.0.8
• Microsoft .NET 8.0: from 8.0.0 before 8.0.27 — fixed in 8.0.27
• Microsoft .NET 9.0: from 9.0.0 before 9.0.16 — fixed in 9.0.16
• Microsoft .NET Framework 3.5: from 3.5.0 before 4.8.9334.0 and 4.8.4802.0 — fixed in 4.8.9334.0 and 4.8.4802.0
• Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 4.8.9334.0 and 4.8.4802.0 — fixed in 4.8.9334.0 and 4.8.4802.0
• Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 4.8.9334.0 and 4.8.4802.0 — fixed in 4.8.9334.0 and 4.8.4802.0
• Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1 before 4.8.9334.0 and 4.8.4802.0 — fixed in 4.8.9334.0 and 4.8.4802.0
• Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before 4.8.9334.0 and 4.8.4802.0 — fixed in 4.8.9334.0 and 4.8.4802.0
• Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.9334.0 and 4.8.4802.0 — fixed in 4.8.9334.0 and 4.8.4802.0
• Microsoft Visual Studio 2026 version 18.5: from 18.5.0 before 18.5.3 — fixed in 18.5.3
• Microsoft Visual Studio 2022 version 17.14: from 17.12.0 before 17.12.20 — fixed in 17.12.20

How to fix

Upgrade to a fixed version: Microsoft .NET 10.0.8, 8.0.27, 9.0.16; Microsoft Visual Studio 2022 version 17.14 17.12.20, 17.14.32; Microsoft Visual Studio 2026 version 18.9 18.5.3; Microsoft .NET 10.0.8; Microsoft .NET 8.0 8.0.27; Microsoft .NET 9.0 9.0.16; Microsoft .NET Framework 3.5 4.8.9334.0 and 4.8.4802.0; Microsoft .NET Framework 3.5 AND 4.7.2 4.8.9334.0 and 4.8.4802.0; Microsoft .NET Framework 3.5 AND 4.8 4.8.9334.0 and 4.8.4802.0; Microsoft .NET Framework 3.5 AND 4.8.1 4.8.9334.0 and 4.8.4802.0; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.8.9334.0 and 4.8.4802.0; Microsoft .NET Framework 4.8 4.8.9334.0 and 4.8.4802.0. Check the vendor advisory for mitigations.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-32177
• https://access.redhat.com/security/cve/CVE-2026-32177
• https://bugzilla.redhat.com/show_bug.cgi?id=2476664
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-32177.json

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