What is CVE-2026-69439?

CVE-2026-69439 is a high-severity vulnerability in Microsoft Visual Studio 2022 Version 17.14, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-08.

How severe is CVE-2026-69439?

High severity. CVSS v3 base score is 8.8 out of 10.

Buffer overflow in Microsoft Visual Studio 2022 Version 17.14

CVE-2026-69439

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

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Microsoft Visual Studio 2022 Version 17.14
Microsoft Visual Studio 2026 Version 18.9
Microsoft .Net 10.0
Microsoft .Net 11.0
Microsoft .Net 8.0
Microsoft .Net 9.0

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

secure@microsoft.com (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-69439?: CVE-2026-69439 is a high-severity vulnerability in Microsoft Visual Studio 2022 Version 17.14, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-08.
How severe is CVE-2026-69439?: High severity. CVSS v3 base score is 8.8 out of 10.