CVE-2025-43535
📋 TL;DR
This CVE describes a memory handling vulnerability in Apple's Safari browser and related operating systems. Processing malicious web content could cause an unexpected process crash (denial of service). Affected users include anyone using vulnerable versions of Safari, iOS, iPadOS, macOS, or visionOS.
💻 Affected Systems
- Safari
- iOS
- iPadOS
- macOS
- visionOS
📦 What is this software?
Ipados by Apple
Ipados by Apple
Macos by Apple
macOS is Apple's desktop and laptop operating system powering Mac computers used by millions of professionals, developers, creative professionals, and enterprise users worldwide. Built on a Unix foundation with the Darwin kernel and modern Cocoa frameworks, macOS delivers a seamless ecosystem integr...
Learn more about Macos →Safari by Apple
⚠️ Risk & Real-World Impact
Worst Case
Complete browser/application crash leading to denial of service and potential data loss if unsaved work is present.
Likely Case
Browser tab or application crash requiring restart, causing temporary disruption to user workflow.
If Mitigated
Minimal impact with proper patching - crashes would be contained to affected processes.
🎯 Exploit Status
Exploitation requires user to visit malicious website but no authentication needed. Apple has addressed this in updates.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, macOS Tahoe 26.2, visionOS 26.2
Vendor Advisory: https://support.apple.com/en-us/125884
Restart Required: Yes
Instructions:
1. Open Settings/System Preferences. 2. Navigate to Software Update. 3. Download and install available updates. 4. Restart device when prompted.
🔧 Temporary Workarounds
Disable JavaScript
allPrevents execution of malicious web content that could trigger the vulnerability
Safari: Safari → Settings → Security → uncheck 'Enable JavaScript'
Use Content Blockers
allBlock potentially malicious websites and scripts
Install reputable content blocker from App Store
🧯 If You Can't Patch
- Restrict browsing to trusted websites only
- Implement network filtering to block known malicious domains
🔍 How to Verify
Check if Vulnerable:
Check current version against affected versions listed in Apple advisoriesCheck Version:
iOS/iPadOS: Settings → General → About → Version; macOS: Apple menu → About This Mac; Safari: Safari → About SafariVerify Fix Applied:
Verify installed version matches or exceeds patched versions listed in CVE📡 Detection & Monitoring
Log Indicators:
- Unexpected Safari/WebKit process crashes
- Application crash logs referencing memory errors
Network Indicators:
- Connections to suspicious domains followed by browser crashes
SIEM Query:
source="*crash*" AND (process="Safari" OR process="WebKit") AND message="*memory*"