---
id: "CVE-2026-118302"
page: "https://infrastack.ai/live/CVE-2026-118302"
kind: "vulnerability"
aliases: ["CVE-2026-118302"]
title: "Microsoft Excel: heap buffer overflow lets a remote attacker run code"
severity: "high"
cvss: 8.8
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["excel", "microsoft-office", "other", "windows"]
not_affected_if: []
published_at: "2026-11-10T19:19:43+00:00"
first_seen_at: "2026-11-10T19:24:52+00:00"
updated_at: "2026-11-10T19:29:51+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-118302", "first_seen_at": "2026-11-10T19:24:52+00:00"}]
exploit_sources: []
---

# Microsoft Excel: heap buffer overflow lets a remote attacker run code

Link for people: https://infrastack.ai/live/CVE-2026-118302 (this .md is for agents)

A heap-based buffer overflow in Microsoft Excel lets an unauthorized attacker run code over a network. The sources give no further detail on which file or action triggers it.

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

## How to check

- Check the installed Excel build against Microsoft's update history for this CVE, which the sources do not list.

## Timeline

- 2026-11-10T19:24:52+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-118302

## From the sources

Heap-based buffer overflow in Microsoft Office Excel 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_