# CVE-2026-66813: Microsoft SQL Server out-of-bounds read privilege escalation

Source: https://junglewise.ai/threats/cve-2026-66813-out-of-bounds-read-in-sql-server-allows-an-unauthorized-attacker  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-66813 · Severity: high · CVSS 8.1 · Published 2026-11-10

SQL Server is a database platform used to store and retrieve business data. An attacker without authorization can read memory outside of intended boundaries, allowing them to escalate privileges and gain administrative control over the database system across a network. This could lead to unauthorized access to sensitive data or complete database compromise.

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

## Quick answers

**Is CVE-2026-66813 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-66813 being exploited in the wild.

**How severe is CVE-2026-66813?** High severity, with a CVSS score of 8.1, published 10 November 2026.

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

**Is there a fix for CVE-2026-66813?** 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-2026-66813 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-66813?** 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

An out-of-bounds read vulnerability in SQL Server allows an unauthenticated attacker to escalate privileges via network access. The vulnerability permits reading memory beyond allocated boundaries, which can be leveraged to bypass authentication and gain elevated privileges on the affected system.

## Affected products

- Microsoft SQL Server

## Timeline

- 2026-11-10: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66813](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66813)

## 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)