CVE-2026-69522: .NET and Visual Studio Remote Code Execution Vulnerability

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-08 · updated 2026-10-31
Weakness: CWE-122

Description

Heap-based buffer overflow in Visual Studio allows an unauthorized attacker to execute code over a network.

Affected products

Microsoft .NET 10.0 runtime: from 10.0.0 before 10.0.12 — fixed in 10.0.12
Microsoft .NET 11.0 runtime: from 11.0.0 before 11.0 RC1 — fixed in 11.0 RC1
Microsoft .NET 8.0 runtime: from 8.0.0 before 8.0.31 — fixed in 8.0.31
Microsoft .NET 9.0 runtime: from 9.0.0 before 9.0.20 — fixed in 9.0.20
Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2: from 3.0.0.0 before 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4145.0 — fixed in 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4145.0
Microsoft .NET Framework 3.5 AND 4.7.2: from 4.7.0 before 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0 — fixed in 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0
Microsoft .NET Framework 3.5 AND 4.8: from 4.8.0 before 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4806.0 — fixed in 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4806.0
Microsoft .NET Framework 3.5 AND 4.8.1: from 4.8.1 before 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9347.0 — fixed in 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9347.0
Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2: from 4.7.0 before 4.7.4145.0 — fixed in 4.7.4145.0
Microsoft .NET Framework 4.8: from 4.8.0 before 4.8.4806.0 — fixed in 4.8.4806.0
Microsoft .NET Framework 4.8.1: from 4.8.0.0 before 4.8.9347.0 — fixed in 4.8.9347.0
Microsoft Visual Studio 2022 version 17.14: from 17.14.0 before 17.14.40 — fixed in 17.14.40
Microsoft Visual Studio 2026 version 18.9: from 18.9.0 before 18.9.3 — fixed in 18.9.3

How to fix

Upgrade to a fixed version: Microsoft .NET 10.0 runtime 10.0.12; Microsoft .NET 11.0 runtime 11.0 RC1; Microsoft .NET 8.0 runtime 8.0.31; Microsoft .NET 9.0 runtime 9.0.20; Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2 2.0.50727.8984 & 3.0.30729.8980 & 4.7.4145.0; Microsoft .NET Framework 3.5 AND 4.7.2 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4145.0; Microsoft .NET Framework 3.5 AND 4.8 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4806.0; Microsoft .NET Framework 3.5 AND 4.8.1 2.0.50727.9183 & 3.0.30729.9169 & 4.8.9347.0; Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 4.7.4145.0; Microsoft .NET Framework 4.8 4.8.4806.0; Microsoft .NET Framework 4.8.1 4.8.9347.0; Microsoft Visual Studio 2022 version 17.14 17.14.40. Check the vendor advisory for mitigations.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69522

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