# CVE-2026-77907: Microsoft Visual Studio heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-77907-microsoft-visual-studio-heap-based-buffer-overflow  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-77907 · Severity: high · CVSS 8.8 · Published 2026-09-08

Microsoft Visual Studio contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code on a user's system over the network. This affects developers and engineering teams who use Visual Studio for software development, potentially compromising their systems and the integrity of code they develop.

Technologies: [Microsoft Visual Studio](https://junglewise.ai/threats/technologies/visual-studio). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-77907 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77907 being exploited in the wild.

**How severe is CVE-2026-77907?** High severity, with a CVSS score of 8.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Visual Studio.

**Is there a fix for CVE-2026-77907?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-77907 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-77907?** Check whether you run Microsoft Visual Studio or Microsoft Visual Studio 2026. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A heap-based buffer overflow exists in Visual Studio, allowing memory corruption when processing untrusted input. The vulnerability is reachable over the network, enabling remote code execution without requiring user authentication or special privileges. An attacker can exploit this flaw to execute arbitrary code in the context of the Visual Studio process. The vulnerability has been addressed by Microsoft in a security update.

## Affected products

- Microsoft Visual Studio

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77907](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77907)

## Related threats

- [Microsoft Visual Studio heap buffer overflow RCE](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-visual-studio-remote-224be73b)
- [Microsoft Visual Studio heap-based buffer overflow](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-visual-studio-remote-6a4b9d28)
- [Microsoft Visual Studio deserialization remote code execution](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-visual-studio-remote-1eb2f932)
- [Microsoft Visual Studio stack-based buffer overflow](https://junglewise.ai/threats/duplicate-advisory-microsoft-security-advisory-visual-studio-remote-d956164d)
- [Microsoft Visual Studio heap buffer overflow RCE](https://junglewise.ai/threats/cve-2026-118745-heap-based-buffer-overflow-in-visual-studio-allows-an)