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The vulnerability stems from improper memory handling within WebKit, the browser engine used across Apple’s ecosystem. When processing a specially crafted web page, a use-after-free or out-of-bounds write condition can be triggered. An attacker can exploit this by luring a user to a malicious site, causing the browser to corrupt memory. Successful exploitation leads to arbitrary code execution with the privileges of the web content process, potentially allowing full system compromise. The flaw resides in the rendering pipeline, specifically in how objects are referenced and released during DOM manipulation or JavaScript execution. Memory corruption occurs because the engine fails to validate object lifetimes under concurrent operations. This is a classic memory safety issue that bypasses modern mitigations when triggered under specific conditions. The attack does not require user interaction beyond visiting the malicious page. On iOS and iPadOS, this could lead to sandbox escape if combined with another vulnerability. The patches address the issue by adding proper reference counting and bounds checks in affected functions.
Platform: Apple ecosystem
Version: iOS 18.6 etc
Vulnerability: memory corruption
Severity: Critical
date: 2026-03-23
Prediction: Already patched
What Undercode Say:
Check current macOS version sw_vers -productVersion Verify iOS version on connected device ideviceinfo -k ProductVersion List installed Safari updates on macOS system_profiler SPInstallationsDataType | grep Safari Check WebKit version in iOS simulator xcrun simctl list devices | grep Booted
How Exploit:
- Craft HTML/JavaScript that triggers a race condition in WebKit’s memory management.
- Use a malicious iframe with repeated navigation and DOM manipulation to force object reuse.
- Leverage spray techniques to place attacker-controlled data into freed memory.
Protection from this CVE:
- Update to Safari 18.6, iOS 18.6, macOS Sequoia 15.6, or the respective patched versions.
- Enable “Fraudulent Website Warning” in Safari settings.
- Restrict JavaScript execution in untrusted contexts via content blockers.
Impact:
- Remote code execution within the web content sandbox.
- Potential for sandbox escape if chained with a kernel or privilege escalation bug.
- Full device compromise on unpatched systems.
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Sources:
Reported By: www.cve.org
Extra Source Hub:
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