---
id: CVE-2026-20627
title: An issue existed in the handling of environment variables
summary: >-
  An issue existed in the handling of environment variables. This issue was
  addressed with improved validation. This issue is fixed in iOS 26.3 and iPadOS
  26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3, visionOS
  26.3, wa…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-20
vendor: apple
product: ipados
affected:
  - ipados < 26.3
  - iphone_os < 26.3
  - 'macos >= 14.0, < 14.8.4'
  - 'macos >= 26.0, < 26.3'
  - visionos < 26.3
  - watchos < 26.3
patched:
  - ipados 26.3
  - iphone_os 26.3
  - macos 26.3
  - visionos 26.3
  - watchos 26.3
published: '2026-02-11'
updated: '2026-08-21'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20627'
references:
  - url: 'https://support.apple.com/en-us/126346'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/126348'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/126349'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/126350'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/126352'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/126353'
    label: product-security@apple.com
tags:
  - nvd
epss: 0.00147
epssPercentile: 0.03292
ingestedAt: '2026-08-21T03:06:25.397Z'
---

## Overview

An issue existed in the handling of environment variables. This issue was addressed with improved validation. This issue is fixed in iOS 26.3 and iPadOS 26.3, macOS Sequoia 15.7.4, macOS Sonoma 14.8.4, macOS Tahoe 26.3, visionOS 26.3, watchOS 26.3. An app may be able to access sensitive user data.

## Affected

- `ipados < 26.3`
- `iphone_os < 26.3`
- `macos >= 14.0, < 14.8.4`
- `macos >= 26.0, < 26.3`
- `visionos < 26.3`
- `watchos < 26.3`

## Remediation

Upgrade past the affected range:

- `ipados 26.3`
- `iphone_os 26.3`
- `macos 26.3`
- `visionos 26.3`
- `watchos 26.3`