---
id: "CVE-2026-96016"
page: "https://infrastack.ai/live/CVE-2026-96016"
kind: "vulnerability"
aliases: ["CVE-2026-96016"]
title: "Windows LSASS: heap overflow lets a local user gain elevated privileges"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "Windows 11 24H2", "fixed": ["10.0.26100.9974"], "affected": ">= 10.0.26100.0, < 10.0.26100.9974", "ecosystem": "vendor"}, {"name": "Windows 11 25H2", "fixed": ["10.0.26200.9974"], "affected": ">= 10.0.26200.0, < 10.0.26200.9974", "ecosystem": "vendor"}, {"name": "Windows 11 26H1", "fixed": ["10.0.28000.3501"], "affected": ">= 10.0.28000.0, < 10.0.28000.3501", "ecosystem": "vendor"}, {"name": "Windows 11 26H2", "fixed": ["10.0.26300.9974"], "affected": ">= 10.0.26300.0, < 10.0.26300.9974", "ecosystem": "vendor"}, {"name": "Windows Server 2022", "fixed": ["10.0.20348.5870"], "affected": ">= 10.0.20348.0, < 10.0.20348.5870", "ecosystem": "vendor"}, {"name": "Windows Server 2025", "fixed": ["10.0.26100.33822"], "affected": ">= 10.0.26100.0, < 10.0.26100.33822", "ecosystem": "vendor"}]
ecosystems: []
tags: ["endpoints", "infrastructure", "lsass", "windows", "windows-11", "windows-server"]
not_affected_if: ["no-local-logon", "patched-november-2026"]
published_at: "2026-11-10T19:21:57+00:00"
first_seen_at: "2026-11-10T19:25:27+00:00"
updated_at: "2026-11-10T20:10:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-96016", "first_seen_at": "2026-11-10T19:25:27+00:00"}, {"source": "analyst", "url": "https://cveawg.mitre.org/api/cve/CVE-2026-96016", "first_seen_at": "2026-11-10T20:10:16+00:00", "cites": ["https://cveawg.mitre.org/api/cve/CVE-2026-96016"]}]
exploit_sources: []
---

# Windows LSASS: heap overflow lets a local user gain elevated privileges

Link for people: https://infrastack.ai/live/CVE-2026-96016 (this .md is for agents)

A heap-based buffer overflow in the Windows Local Security Authority Subsystem Service (LSASS) lets an authorized local user escalate privileges. An attacker who already has a login on the machine can gain higher system rights.

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

## Affected

- vendor:Windows 11 24H2 affected >= 10.0.26100.0, < 10.0.26100.9974 fixed 10.0.26100.9974
- vendor:Windows 11 25H2 affected >= 10.0.26200.0, < 10.0.26200.9974 fixed 10.0.26200.9974
- vendor:Windows 11 26H1 affected >= 10.0.28000.0, < 10.0.28000.3501 fixed 10.0.28000.3501
- vendor:Windows 11 26H2 affected >= 10.0.26300.0, < 10.0.26300.9974 fixed 10.0.26300.9974
- vendor:Windows Server 2022 affected >= 10.0.20348.0, < 10.0.20348.5870 fixed 10.0.20348.5870
- vendor:Windows Server 2025 affected >= 10.0.26100.0, < 10.0.26100.33822 fixed 10.0.26100.33822

## How to check

Run winver or [System.Environment]::OSVersion / 'cmd /c ver' and compare the full build (e.g. 10.0.26100.xxxx) with the fixed builds; lower means exposed. Windows 10 and Server 2016/2019 are not in Microsoft's affected list.

## Fix

Install the November 2026 Windows cumulative update that brings the build to at least: Win11 24H2 10.0.26100.9974, 25H2 10.0.26200.9974, 26H1 10.0.28000.3501, 26H2 10.0.26300.9974, Server 2022 10.0.20348.5870, Server 2025 10.0.26100.33822. KB numbers not confirmed; check the MSRC page.

## Timeline

- 2026-11-10T19:25:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-96016
- 2026-11-10T20:10:16+00:00 analyst https://cveawg.mitre.org/api/cve/CVE-2026-96016 — MSRC page is JS-only and unreadable here; used Microsoft's own CVE record (CNA) for builds. No KB numbers found, no exploitation or PoC seen. Verified products only.

## Documents

- [advisory] CVE-2026-96016 CVE record (Microsoft CNA) https://cveawg.mitre.org/api/cve/CVE-2026-96016

## From the sources

Heap-based buffer overflow in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to elevate privileges locally.

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