# CVE-2026-67636: Microsoft SQL Server out-of-bounds read allows remote code execution

Source: https://junglewise.ai/threats/cve-2026-67636-microsoft-sql-server-out-of-bounds-read-allows-remote-code  
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-2026-67636 · Severity: critical · CVSS 9 · Published 2026-09-08

Microsoft SQL Server contains an out-of-bounds read vulnerability that allows an unauthenticated attacker to execute arbitrary code remotely without user interaction. SQL Server is a critical database system used by organizations to store and manage sensitive business data. Successful exploitation could lead to complete database compromise, data theft, service disruption, and lateral movement within the organization's infrastructure.

Technologies: [Microsoft SQL Server](https://junglewise.ai/threats/technologies/sql-server). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-67636 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-67636 being exploited in the wild.

**How severe is CVE-2026-67636?** Critical severity, with a CVSS score of 9, published 8 September 2026.

**Which products and versions are affected?** Microsoft SQL Server.

**Is there a fix for CVE-2026-67636?** 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-2026-67636 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-67636?** 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

The vulnerability is an out-of-bounds read in Microsoft SQL Server that can be exploited to achieve remote code execution (RCE). The flaw allows an unauthenticated attacker on the network to send specially crafted requests that trigger memory access beyond allocated buffer boundaries. The out-of-bounds read can be leveraged to leak sensitive data or corrupt memory state, ultimately enabling arbitrary code execution with the privileges of the SQL Server process. This is a network-reachable vulnerability requiring no authentication or user interaction. Patch availability should be verified through Microsoft's Security Response Center.

## Affected products

- Microsoft SQL Server

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67636](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67636)

## Related threats

- [Microsoft SQL Server heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-94513-heap-based-buffer-overflow-in-sql-server-allows-an-authorized)
- [Microsoft SQL Server heap-based buffer overflow](https://junglewise.ai/threats/cve-2026-94511-heap-based-buffer-overflow-in-sql-server-allows-an-authorized)
- [Microsoft SQL Server heap buffer overflow](https://junglewise.ai/threats/cve-2026-88111-heap-based-buffer-overflow-in-sql-server-allows-an-authorized)
- [Microsoft SQL Server privilege escalation via exposed method](https://junglewise.ai/threats/cve-2026-84010-exposed-dangerous-method-or-function-in-sql-server-allows-an)
- [Microsoft SQL Server information disclosure via uninitialized resource](https://junglewise.ai/threats/cve-2026-68783-use-of-uninitialized-resource-in-sql-server-allows-an-authorized)