---
id: CVE-2026-50420
title: >-
  Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to
  disclose information locally.
summary: >-
  Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to
  disclose information locally.
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-125
vendor: microsoft
product: windows_11_24h2
affected:
  - windows_11_24h2 < 10.0.26100.8875
  - windows_11_25h2 < 10.0.26200.8875
  - windows_11_26h1 < 10.0.28000.2269
  - windows_11_26h1 < 10.0.28000.2525
  - windows_server_2025 < 10.0.26100.33158
patched:
  - windows_11_24h2 10.0.26100.8875
  - windows_11_25h2 10.0.26200.8875
  - windows_11_26h1 10.0.28000.2525
  - windows_server_2025 10.0.26100.33158
published: '2026-07-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50420'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50420'
    label: secure@microsoft.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-16T13:54:29.557900Z'
epss: 0.00408
epssPercentile: 0.34903
ingestedAt: '2026-09-08T17:06:31.916Z'
---

## Overview

Out-of-bounds read in Windows HTTP.sys allows an unauthorized attacker to disclose information locally.

## Affected

- `windows_11_24h2 < 10.0.26100.8875`
- `windows_11_25h2 < 10.0.26200.8875`
- `windows_11_26h1 < 10.0.28000.2269`
- `windows_11_26h1 < 10.0.28000.2525`
- `windows_server_2025 < 10.0.26100.33158`

## Remediation

Upgrade past the affected range:

- `windows_11_24h2 10.0.26100.8875`
- `windows_11_25h2 10.0.26200.8875`
- `windows_11_26h1 10.0.28000.2525`
- `windows_server_2025 10.0.26100.33158`