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CVE-2025-43434 is a WebKit use-after-free vulnerability credited to Google Big Sleep. Apple describes the issue as a use-after-free addressed with improved memory management. The flaw can be triggered when Safari or other WebKit-based consumers process maliciously crafted web content. The issue was fixed in Safari 26.1, iOS 18.7.2 and iPadOS 18.7.2, iOS 26.1 and iPadOS 26.1, macOS Tahoe 26.1, visionOS 26.1, watchOS 26.1, and in WebKitGTK and WPE WebKit before 2.50.2.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Insufficient checks allowing an app to monitor keystrokes without user permission.
A use-after-free vulnerability in web content processing associated in the advisory with unexpected Safari crashes on macOS Sonoma and macOS Sequoia.
A WebKit use-after-free vulnerability in Safari 26.1 addressed with improved memory management.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.