Use-after-free in Apple Safari/WebKit
CVE-2026-43727 is a use-after-free vulnerability in Apple Safari/WebKit-related web content processing. Apple states that processing maliciously crafted web content can trigger the flaw and lead to an unexpected Safari crash. The issue was addressed through improved memory management and is fixed in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, and macOS Tahoe 26.5.2.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Recent activity
6 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 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.
A use-after-free vulnerability in Apple web content processing that could cause an unexpected Safari crash.
The version that knows your environment.
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.