CVE-2026-69439
High
Description
Heap-based buffer overflow in .NET and Visual Studio allows an unauthorized attacker to elevate privileges over a network.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Microsoft .net
PublishedSep 8, 2026
First seenSep 8, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- microsoft .net8.0.31, 9.0.20, 10.0.12 or later
- microsoft visual_studio_202217.14.40 or later
- microsoft visual_studio_202618.9.3 or later
- Microsoft.DiaSymReader.Native18.9.0-beta1.26405.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft .net | 8.0.0 ≤ v < 8.0.31, 9.0.0 ≤ v < 9.0.20, 10.0.0 ≤ v < 10.0.12, 11.0.0 | 8.0.31, 9.0.20, 10.0.12 |
| microsoft visual_studio_2022 | 17.14.0 ≤ v < 17.14.40 | 17.14.40 |
| microsoft visual_studio_2026 | 18.9.0 ≤ v < 18.9.3 | 18.9.3 |
| Microsoft.DiaSymReader.NativeNuGet | 17.10.0-beta1.24272.1 ≤ v < 18.9.0-beta1.26405.2 | 18.9.0-beta1.26405.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.