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CVE-2026-43727 is a use-after-free vulnerability in WebKit affecting Safari and Apple platforms that embed the WebKit engine. The flaw occurs during processing of maliciously crafted web content and was addressed through improved memory management. Successful triggering can cause Safari to crash unexpectedly. Apple reports fixes in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, macOS Tahoe 26.5.2, visionOS 26.6, and watchOS 26.6.
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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.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A WebKit vulnerability where malicious web content may cause Safari to crash unexpectedly.
A WebKit vulnerability where processing maliciously crafted web content may lead to an unexpected Safari crash.
A use-after-free vulnerability in web content processing that could cause an unexpected Safari crash.
A macOS Tahoe vulnerability in web content processing involving use-after-free that may cause an unexpected Safari crash.
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.