---
id: CVE-2026-67643
title: >-
  Heap-based buffer overflow in SQL Server allows an unauthorized attacker to
  execute code over a network.
summary: >-
  Heap-based buffer overflow in SQL Server allows an unauthorized attacker to
  execute code over a network.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: microsoft
product: sql_server_2022
affected:
  - sql_server_2022 < 16.0.1200.5
  - 'sql_server_2022 >= 16.0.4003.1, < 16.0.4275.2'
  - sql_server_2025 < 17.0.1135.8
  - 'sql_server_2025 >= 17.0.4006.2, < 17.0.4085.5'
patched:
  - sql_server_2022 16.0.4275.2
  - sql_server_2025 17.0.4085.5
published: '2026-09-08'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T20:17:00.937'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-67643'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67643'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T04:24:47.113385Z'
epss: 0.0089
epssPercentile: 0.57824
ingestedAt: '2026-09-08T19:08:49.605Z'
---

## Overview

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

## Affected

- `sql_server_2022 < 16.0.1200.5`
- `sql_server_2022 >= 16.0.4003.1, < 16.0.4275.2`
- `sql_server_2025 < 17.0.1135.8`
- `sql_server_2025 >= 17.0.4006.2, < 17.0.4085.5`

## Remediation

Upgrade past the affected range:

- `sql_server_2022 16.0.4275.2`
- `sql_server_2025 17.0.4085.5`