Quick answers
- Is CVE-2026-67631 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-67631 being exploited in the wild.
- How severe is CVE-2026-67631?
- Critical severity, with a CVSS score of 9.8, published 8 September 2026.
- Which products and versions are affected?
- Microsoft SQL Server.
- Is there a fix for CVE-2026-67631?
- 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-2026-67631 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-67631?
- Check whether you run Microsoft SQL Server. 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
This is a heap-based buffer overflow vulnerability in Microsoft SQL Server that permits unauthenticated remote code execution. The vulnerability is reachable over the network (network attack vector) and requires no authentication or user interaction to exploit. An attacker can send a specially crafted network packet to trigger the buffer overflow, achieving arbitrary code execution with the privileges of the SQL Server process. A patch from Microsoft is expected via the Security Update Guide referenced in the advisory.
Affected products
- Microsoft SQL Server
Timeline
- 2026-09-08: disclosed