Quick answers
- Is CVE-2026-67391 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-67391 being exploited in the wild.
- How severe is CVE-2026-67391?
- High severity, with a CVSS score of 8.8, published 10 November 2026.
- Which products and versions are affected?
- Microsoft SQL Server <UNKNOWN>.
- Is there a fix for CVE-2026-67391?
- 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-2026-67391 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-67391?
- Check whether you run Microsoft SQL Server at an affected version. 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 SQL Server that permits remote code execution when triggered by an authorized attacker over the network. The vulnerability requires valid database credentials but no additional user interaction. Successful exploitation results in arbitrary code execution with SQL Server process privileges.
Affected products
- Microsoft SQL Server <UNKNOWN>
Timeline
- 2026-11-10: disclosed