---
id: "CVE-2026-119831"
page: "https://infrastack.ai/live/CVE-2026-119831"
kind: "vulnerability"
aliases: ["CVE-2026-119831"]
title: "Windows Installer: heap overflow lets a local user gain higher privileges"
severity: "high"
cvss: 7.0
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows Installer", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["infrastructure", "windows", "windows-installer"]
not_affected_if: ["no-local-accounts", "single-user-machine"]
published_at: "2026-11-10T19:19:58+00:00"
first_seen_at: "2026-11-10T19:24:58+00:00"
updated_at: "2026-11-10T19:51:50+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119831", "first_seen_at": "2026-11-10T19:24:58+00:00"}]
exploit_sources: []
---

# Windows Installer: heap overflow lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-119831 (this .md is for agents)

A heap-based buffer overflow in Windows Installer lets an authorized local user raise their privileges. An attacker who already has a foothold on the machine can gain elevated rights.

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

## Affected

- vendor:Windows Installer affected range not listed fixed no fixed version listed

## How to check

- Check the Windows build with `winver` and compare it against the Microsoft security update for CVE-2026-119831 (unknown if the sources list affected builds)
- Review Windows Update history for the installer component (unknown if the sources name a patch)

## Timeline

- 2026-11-10T19:24:58+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119831

## From the sources

Heap-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

---

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