---
id: CVE-2026-78442
title: >-
  Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker
  to execute code over a network.
summary: >-
  Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker
  to execute code over a network.
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
vendor: microsoft
product: sql_server_2017
affected:
  - sql_server_2017 < 14.0.2130.4
  - 'sql_server_2017 >= 14.0.3006.16, < 14.0.3550.4'
  - sql_server_2019 < 15.0.2190.7
  - 'sql_server_2019 >= 15.0.4003.23, <= 15.0.4490.9'
patched:
  - sql_server_2017 14.0.3550.4
  - sql_server_2019 15.0.2190.7
published: '2026-09-08'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T15:36:54.890'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-78442'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-78442'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
epss: 0.00819
epssPercentile: 0.55486
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-08T19:22:50.866846Z'
ingestedAt: '2026-09-08T19:08:49.628Z'
---

## Overview

Heap-based buffer overflow in Windows OLE DB allows an unauthorized attacker to execute code over a network.

## Affected

- `sql_server_2017 < 14.0.2130.4`
- `sql_server_2017 >= 14.0.3006.16, < 14.0.3550.4`
- `sql_server_2019 < 15.0.2190.7`
- `sql_server_2019 >= 15.0.4003.23, <= 15.0.4490.9`

## Remediation

Upgrade past the affected range:

- `sql_server_2017 14.0.3550.4`
- `sql_server_2019 15.0.2190.7`