---
id: "CVE-2026-66801"
page: "https://infrastack.ai/live/CVE-2026-66801"
kind: "vulnerability"
aliases: ["CVE-2026-66801"]
title: "Xbox: heap buffer overflow lets a network attacker run code"
severity: "critical"
cvss: 9.8
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Xbox", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["console", "network", "other", "rce", "xbox"]
not_affected_if: []
published_at: "2026-11-10T19:21:17+00:00"
first_seen_at: "2026-11-10T19:25:16+00:00"
updated_at: "2026-11-10T19:30:21+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-66801", "first_seen_at": "2026-11-10T19:25:16+00:00"}, {"source": "analyst", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66801", "first_seen_at": "2026-11-10T19:30:21+00:00", "cites": ["https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66801"]}]
exploit_sources: []
---

# Xbox: heap buffer overflow lets a network attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-66801 (this .md is for agents)

A heap-based buffer overflow in Xbox lets an unauthorized attacker reach the device over a network. The sources say the attacker can execute code.

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

## Affected

- vendor:Xbox affected range not listed fixed no fixed version listed

## How to check

Unknown until MSRC details are read. Check MSRC CVE-2026-66801 for affected Xbox models and the fixed system update; on the console see Settings > System > Updates and install any pending update.

## Timeline

- 2026-11-10T19:25:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-66801
- 2026-11-10T19:30:21+00:00 analyst https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66801 — MSRC page exists (title: Microsoft Xbox Remote Code Execution Vulnerability) but body is JS-rendered; web-cli and browser-cli could not read it. No affected models, fixed build or exploitation status confirmed. Nothing verified. Revisit when readable (try CSAF/API or cve.org).

## Documents

- [advisory] CVE-2026-66801 - Microsoft Xbox Remote Code Execution Vulnerability (MSRC) https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66801

## From the sources

Heap-based buffer overflow in Xbox allows an unauthorized 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_