Visual Studio Buffer Overflow Vulnerability: Critical Security Alert
- Severity
- HIGH
- Affected component
- visual studio (nuget)
- Patched version
- Not yet available
A critical heap-based buffer overflow vulnerability in Visual Studio enables unauthorized remote code execution. Users of Visual Studio are advised to monitor for updates.
What happened
A high severity vulnerability, tracked as CVE-2026-69522 and GHSA-2j8r-3c22-8565, has been confirmed in Visual Studio. This vulnerability allows an unauthorized attacker to execute code over a network due to a heap-based buffer overflow. The advisory for this vulnerability has been withdrawn as it is a duplicate of GHSA-2j8r-3c22-8565. Users should refer to the original advisory for further details and patches.
The vulnerability was first flagged on 2026-09-08T18:32:43+00:00 and confirmed on 2026-09-08T22:12:17.086626+00:00. It has not been exploited in the wild as of the latest reports. The affected component is Visual Studio, though no authoritative version range has been published yet.
What to do about it
- Monitor the original advisory GHSA-2j8r-3c22-8565 for further details and patches.
- Stay informed about updates from trusted sources such as the NCSC and GitHub security advisories.
- Implement network security measures to mitigate the risk of remote code execution.
- Review and update your incident response plan to address potential exploitation of this vulnerability.
- No official fix has been published yet. Monitor the sources below for updates.
How 0Day would have caught this
visual studio is anywhere in your dependency tree, the engineers who own the affected repositories get a push alert the moment it is flagged — no manual audit to remember to run.Read how this differs from waiting on a scanner to catch a known advisory, or see the exact, read-only access 0Day needs to do this for an organization.
Frequently asked questions
Am I affected?
If you are using Visual Studio, you may be affected. Consult the original advisory GHSA-2j8r-3c22-8565 for more information.
What should I do right now?
Monitor the original advisory GHSA-2j8r-3c22-8565 for further details and patches. Stay informed about updates from trusted sources.
Is there a patch available?
No official fix has been published yet. Monitor the sources for updates.
How can I protect my network from this vulnerability?
Implement network security measures to mitigate the risk of remote code execution and review your incident response plan.
Sources
- NCSC-2026-0351 [1.00] [M/H] Kwetsbaarheden verholpen in Microsoft Developer Tools
- [GHSA-2j8r-3c22-8565] Microsoft Security Advisory CVE-2026-69522 – .NET and Visual Studio Remote Code Execution Vulnerability
- [GHSA-527h-q9f6-p7qx] Microsoft Security Advisory CVE-2026-69439 – .NET and Visual Studio Elevation of Privilege Vulnerability
- [GHSA-63gh-g2x5-x69v] Microsoft Security Advisory CVE-2026-71328 – .NET and Visual Studio Remote Code Execution Vulnerability
- [GHSA-q72m-f2r4-w4cw] Duplicate Advisory: Microsoft Security Advisory CVE-2026-69522 – .NET and Visual Studio Remote Code Execution Vulnerability
- [CVE-2026-81376] CVSS 9.6 CRITICAL
- The Agentic IDE Extension Blind Spot