# CVE-2026-77906: Microsoft Visual Studio heap-based buffer overflow

Source: https://junglewise.ai/threats/cve-2026-77906-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-2026-77906 · Severity: high · CVSS 8.8 · Published 2026-09-08

Microsoft Visual Studio, a widely used integrated development environment, contains a heap-based buffer overflow vulnerability that allows an attacker to execute arbitrary code over the network without authentication. Exploitation of this flaw could enable attackers to gain complete control of affected developer systems, leading to compromise of source code, build artifacts, and developer credentials used to access corporate infrastructure.

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

## Quick answers

**Is CVE-2026-77906 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-77906 being exploited in the wild.

**How severe is CVE-2026-77906?** 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-2026-77906?** 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-2026-77906 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-77906?** 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 Microsoft Visual Studio that can be triggered over the network. The vulnerability allows an unauthenticated attacker to send a specially crafted payload that overflows a heap buffer, corrupting memory and enabling execution of arbitrary code with the privileges of the user running Visual Studio. No authentication or user interaction is required to trigger the vulnerability; the attack vector is network-based. The CVSS v3.1 score of 8.8 reflects the high severity due to the combination of network accessibility, lack of authentication requirements, and potential for complete system compromise.

## Affected products

- Microsoft Visual Studio

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77906](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77906)

## 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)