CVE-2026-69963: Microsoft Streaming Service heap-based buffer overflow

CVE-2026-69963 · Severity: high · CVSS 7.8 · Published 2026-10-13

A heap-based buffer overflow vulnerability in Microsoft Streaming Service allows an authorized user to gain elevated privileges on their local system. An attacker with user-level access could exploit this to gain administrator-level control of the affected computer.

Technologies: Microsoft Streaming Service. Vendors: Microsoft.

Quick answers

Is CVE-2026-69963 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-69963 being exploited in the wild.
How severe is CVE-2026-69963?
High severity, with a CVSS score of 7.8, published 13 October 2026.
Which products and versions are affected?
Microsoft Streaming Service.
Is there a fix for CVE-2026-69963?
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-2026-69963 attacked?
It is attacked with local access, in a hosted service.
Am I affected by CVE-2026-69963?
Check whether you run Microsoft Streaming Service. 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 Streaming Service that can be triggered by an authenticated attacker with local access. The vulnerability allows arbitrary code execution with elevated privileges. The vendor has issued a security update to address this issue.

Affected products

  • Microsoft Streaming Service

Timeline

  • 2026-10-13: disclosed

References

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