Out-of-bounds Read in Microsoft SQL Server 2017 For X64-Based Systems (Cu31)
CVE-2026-66813
Out-of-bounds read in SQL Server allows an unauthorized attacker to elevate privileges over a network.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Microsoft SQL Server 2017 For X64-Based Systems (Cu31)
- Microsoft SQL Server 2017 (Gdr)
- Microsoft SQL Server 2019 For X64-Based Systems (Cu32)
- Microsoft SQL Server 2019 (Gdr)
- Microsoft SQL Server 2022 For X64-Based Systems (Cu27)
- Microsoft SQL Server 2022 (Gdr)
- Microsoft SQL Server 2025 Cu10
- Microsoft SQL Server 2025 For X64-Based Systems (Gdr)
Weakness classification (CWE)
References
- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66813 (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-66813?
- CVE-2026-66813 is a high-severity vulnerability in Microsoft SQL Server 2017 For X64-Based Systems (Cu31), classified under Out-of-bounds Read. CVSS score: 8.1/10. Published 2026-11-10.
- How severe is CVE-2026-66813?
- High severity. CVSS v3 base score is 8.1 out of 10.