---
id: "CVE-2026-119929"
page: "https://infrastack.ai/live/CVE-2026-119929"
kind: "vulnerability"
aliases: ["CVE-2026-119929"]
title: "Windows Installer: use-after-free lets a local user gain higher privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "windows", "windows-installer"]
not_affected_if: ["no-local-users"]
published_at: "2026-11-10T19:20:14+00:00"
first_seen_at: "2026-11-10T19:25:03+00:00"
updated_at: "2026-11-10T22:20:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119929", "first_seen_at": "2026-11-10T19:25:03+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-11-10T22:20:54+00:00"}]
exploit_sources: []
---

# Windows Installer: use-after-free lets a local user gain higher privileges

Link for people: https://infrastack.ai/live/CVE-2026-119929 (this .md is for agents)

A memory-handling bug in Windows Installer lets an already-authorized local user trigger a use-after-free and elevate their privileges on the machine. The sources give no further technical detail, and an attacker needs a local account first.

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

## How to check

- Open https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-119929 and find your Windows version/build in the Security Updates table to get the KB number
- Run winver (or [System.Environment]::OSVersion) for your build and Get-HotFix in PowerShell to see whether that KB is installed
- Until Microsoft's KB is confirmed, install the November 2026 cumulative update (released 2026-11-10)

## Timeline

- 2026-11-10T19:25:03+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119929
- 2026-11-10T22:20:54+00:00 analyst — Could not read the MSRC update guide entry (JS-only page; CVRF API 2026-Nov doc too large, per-CVE endpoint 404). Affected builds, KBs and fixed builds remain unknown; nothing verified. Settle by opening the entry in a browser or the CVRF doc.

## From the sources

Use after free in Windows Installer allows an authorized attacker to elevate privileges locally.

---

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