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Vulnerability · Published Sep 8, 2026 · Assigned by microsoft

CVE-2026-69439.NET and Visual Studio Elevation of Privilege Vulnerability

High 8.8

In plain English

A high-severity heap buffer overflow in Microsoft Visual Studio 2022 version 17.14 from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 57% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.8%top 42.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.23dotnet10-runtime10.0.13-r0ALPINE-CVE-2026-69439
Alpine:v3.24dotnet10-runtime10.0.12-r0ALPINE-CVE-2026-69439
Alpine:v3.22dotnet8-runtime8.0.31-r0ALPINE-CVE-2026-69439
Alpine:v3.23dotnet8-runtime8.0.31-r0ALPINE-CVE-2026-69439
Alpine:v3.24dotnet8-runtime8.0.31-r0ALPINE-CVE-2026-69439
Alpine:v3.22dotnet9-runtime9.0.20-r0ALPINE-CVE-2026-69439
Alpine:v3.23dotnet9-runtime9.0.20-r0ALPINE-CVE-2026-69439
Alpine:v3.24dotnet9-runtime9.0.20-r0ALPINE-CVE-2026-69439
NuGetmicrosoft.diasymreader.native18.9.0-beta1.26405.2GHSA-527h-q9f6-p7qx
Ubuntu:22.04:LTSdotnet7no fix listedUBUNTU-CVE-2026-69439

Affected products (as reported)

VendorProductVersions
Microsoft .NET 10.0 runtime 10.0.0 – before 10.0.12
Microsoft .NET 11.0 runtime 11.0.0 – before 11.0 RC1
Microsoft .NET 8.0 runtime 8.0.0 – before 8.0.31
Microsoft .NET 9.0 runtime 9.0.0 – before 9.0.20
Microsoft Microsoft Visual Studio 2022 version 17.14 17.14.0 – before 17.14.40
Microsoft Microsoft Visual Studio 2026 version 18.9 18.9.0 – before 18.9.3

Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

References