---
id: "CVE-2026-67646"
page: "https://infrastack.ai/live/CVE-2026-67646"
kind: "vulnerability"
aliases: ["CVE-2026-67646"]
title: "Microsoft SQL Server: heap overflow lets an authorized user run code remotely"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "vendor"
products: []
ecosystems: []
tags: ["auth-required", "database", "sql-server", "vendor", "windows"]
not_affected_if: ["auth-required", "no-authorized-accounts", "no-network-access"]
published_at: "2026-11-10T19:21:19+00:00"
first_seen_at: "2026-11-10T19:25:16+00:00"
updated_at: "2026-11-10T21:17:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67646", "first_seen_at": "2026-11-10T19:25:16+00:00"}, {"source": "analyst", "url": "https://tri.opswat.com/vulnerabilities/CVE-2026-67646", "first_seen_at": "2026-11-10T21:17:23+00:00", "cites": ["https://tri.opswat.com/vulnerabilities/CVE-2026-67646"]}]
exploit_sources: []
---

# Microsoft SQL Server: heap overflow lets an authorized user run code remotely

Link for people: https://infrastack.ai/live/CVE-2026-67646 (this .md is for agents)

Heap-based buffer overflow (CWE-122) in Microsoft SQL Server. An attacker who can already log in (low privileges) can run code over the network. CVSS 3.1 8.8. No exploitation or public PoC recorded; Microsoft's own page could not be read, so fixed builds are not confirmed.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

Run SELECT SERVERPROPERTY('ProductVersion'), SERVERPROPERTY('ProductUpdateLevel'); and compare with the fixed builds on Microsoft's advisory https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67646. Aggregator data suggests SQL Server 2025 below 17.0.5045.3 (CU10 line) may be affected; not confirmed.

## Timeline

- 2026-11-10T19:25:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-67646
- 2026-11-10T21:17:23+00:00 analyst https://tri.opswat.com/vulnerabilities/CVE-2026-67646 — MSRC page is JS-only and did not load via web-cli; only an aggregator (OPSWAT) copy read, so nothing verified and no fixed build confirmed. Aggregator lists SQL Server 2025 builds >=17.0.4006.0 <17.0.5045.3 and >=17.0.1050.2 <17.0.1155.3 (unconfirmed). Revisit with MSRC CSAF/browser to get fixed builds.

## Documents

- [mentions] OPSWAT MetaDefender Tri: CVE-2026-67646 (aggregator copy of the MSRC record) https://tri.opswat.com/vulnerabilities/CVE-2026-67646

## From the sources

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

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