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CVE-2025-43427 is a denial-of-service vulnerability in WebKit affecting Safari, WebKitGTK, and WPE WebKit. The flaw is triggered when the engine processes maliciously crafted web content and results in an unexpected process crash. The issue was addressed through improved state management, indicating the root cause involved incorrect handling of internal object or execution state during web content processing. Affected products include WebKitGTK and WPE WebKit before 2.50.2, as well as Apple platforms fixed in Safari 26.1, iOS 26.1, iPadOS 26.1, macOS Tahoe 26.1, tvOS 26.1, and visionOS 26.1.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Web content processing issue leading to unexpected process crash.
A web content processing vulnerability associated in the advisory with unexpected process crashes on macOS Sonoma and macOS Sequoia.
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.