---
id: CVE-2026-83578
title: >-
  Integer underflow (wrap or wraparound) in Windows PowerShell allows an
  unauthorized attacker to execute code over a network.
summary: >-
  Integer underflow (wrap or wraparound) in Windows PowerShell allows an
  unauthorized attacker to execute code over a network.
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-122
  - CWE-190
  - CWE-191
published: '2026-10-13'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T21:18:27.350'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83578'
references:
  - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-83578'
    label: secure@microsoft.com
tags:
  - nvd
ingestedAt: '2026-10-13T19:43:29.067Z'
---

## Overview

Integer underflow (wrap or wraparound) in Windows PowerShell allows an unauthorized attacker to execute code over a network.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.