---
id: CVE-2026-20636
title: The issue was addressed with improved memory handling
summary: >-
  The issue was addressed with improved memory handling. This issue is fixed in
  Safari 26.3, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, visionOS 26.3.
  Processing maliciously crafted web content may lead to an unexpected process
  crash.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cwe:
  - CWE-119
  - CWE-120
vendor: apple
product: safari
affected:
  - safari < 26.3
  - ipados < 26.3
  - iphone_os < 26.3
  - macos < 26.3
  - visionos < 26.3
patched:
  - safari 26.3
  - ipados 26.3
  - iphone_os 26.3
  - macos 26.3
  - visionos 26.3
published: '2026-02-11'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-20636'
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/126353'
    label: product-security@apple.com
  - url: 'https://support.apple.com/en-us/126354'
    label: product-security@apple.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:10702'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11329'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:11814'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:13845'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:14659'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:16056'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:16695'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:19206'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:19535'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:22136'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:9692'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-20636'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2448791'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20636.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
tags:
  - nvd
epss: 0.00395
epssPercentile: 0.30889
ingestedAt: '2026-07-03T18:53:52.404Z'
---

## Overview

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.3, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, visionOS 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.

## Affected

- `safari < 26.3`
- `ipados < 26.3`
- `iphone_os < 26.3`
- `macos < 26.3`
- `visionos < 26.3`

## Remediation

Upgrade past the affected range:

- `safari 26.3`
- `ipados 26.3`
- `iphone_os 26.3`
- `macos 26.3`
- `visionos 26.3`