---
id: CVE-2026-78456
title: >-
  Heap-based buffer overflow in SQL Server allows an authorized attacker to
  execute code over a network.
summary: >-
  Heap-based buffer overflow in SQL Server allows an authorized attacker to
  execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/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'
patched:
  - sql_server_2022 16.0.4275.2
published: '2026-09-08'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T14:55:45.910'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78456'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78456'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00913
epssPercentile: 0.58417
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-09T04:26:37.436763Z'
ingestedAt: '2026-09-08T19:08:49.629Z'
---

## Overview

Heap-based buffer overflow in SQL Server allows an authorized 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`

## Remediation

Upgrade past the affected range:

- `sql_server_2022 16.0.4275.2`