What is CVE-2026-83945?

CVE-2026-83945 is a medium-severity vulnerability in Microsoft SQL Server 2022 For X64-Based Systems (Cu27), classified under Heap-based Buffer Overflow. CVSS score: 6.6/10. Published 2026-10-13.

How severe is CVE-2026-83945?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Buffer overflow in Microsoft SQL Server 2022 For X64-Based Systems (Cu27)

CVE-2026-83945

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

Vulnerability class: Buffer Overflow

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/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

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83945 (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-83945?: CVE-2026-83945 is a medium-severity vulnerability in Microsoft SQL Server 2022 For X64-Based Systems (Cu27), classified under Heap-based Buffer Overflow. CVSS score: 6.6/10. Published 2026-10-13.
How severe is CVE-2026-83945?: Medium severity. CVSS v3 base score is 6.6 out of 10.