---
id: "CVE-2026-67637"
page: "https://infrastack.ai/live/CVE-2026-67637"
kind: "vulnerability"
aliases: ["CVE-2026-67637"]
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: "other"
products: []
ecosystems: []
tags: ["authenticated", "microsoft", "other", "sql-server", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:21:19+00:00"
first_seen_at: "2026-11-10T19:25:16+00:00"
updated_at: "2026-11-10T21:17:25+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67637", "first_seen_at": "2026-11-10T19:25:16+00:00"}, {"source": "analyst", "url": "https://tri.opswat.com/vulnerabilities/CVE-2026-67637", "first_seen_at": "2026-11-10T21:17:25+00:00", "cites": ["https://tri.opswat.com/vulnerabilities/CVE-2026-67637"]}]
exploit_sources: []
---

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

Link for people: https://infrastack.ai/live/CVE-2026-67637 (this .md is for agents)

A heap-based buffer overflow (CWE-122) in Microsoft SQL Server lets a user who is already logged in with low privileges run code over the network. Microsoft published it in the November 2026 security updates; CVSS 8.8. No exploitation or public proof of concept is recorded. Affected builds and fixed builds are not confirmed from Microsoft's own page.

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

## How to check

Run SELECT @@VERSION on each SQL Server instance and compare it with the build listed for CVE-2026-67637 on the Microsoft Security Update Guide (msrc.microsoft.com/update-guide/vulnerability/CVE-2026-67637). An aggregator copy of Microsoft's data (not confirmed) lists SQL Server 2017 builds below 14.0.3570.2 (CU31 line) and SQL Server 2025 builds from 17.0.1050.2 up to below 17.0.1155.3; it also shows 16 affected product entries that we could not read.

## Fix

unknown: install the November 2026 SQL Server security update (GDR or CU track matching your instance) once you confirm the build on the Microsoft page.

## Timeline

- 2026-11-10T19:25:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-67637
- 2026-11-10T21:17:25+00:00 analyst https://tri.opswat.com/vulnerabilities/CVE-2026-67637 — MSRC page is JS-only and unreadable here (CVRF API only confirms it is in the 2026-Nov release, 2026-11-10). Only an aggregator (OPSWAT) copy of MSRC data was readable: CWE-122, CVSS 8.8 (AV:N/AC:L/PR:L), not exploited, no PoC, ranges for SQL Server 2017 and 2025 only. No fixed builds found; nothing verified.

## Documents

- [mentions] CVE-2026-67637 - MetaDefender Tri (aggregator copy of MSRC data) https://tri.opswat.com/vulnerabilities/CVE-2026-67637

## From the sources

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

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_