Use-after-free in Apple Web Extensions
CVE-2026-43704 is a use-after-free vulnerability in Apple Web Extensions. Apple states that the issue was addressed through improved memory management. Successful triggering of the flaw by a malicious web extension can lead to an unexpected process crash. The issue affects Safari 26.5.2 prior to patching, iOS 26.5.2 prior to patching, iPadOS 26.5.2 prior to patching, and macOS Tahoe 26.5.2 prior to patching.
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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
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Web Extensions vulnerability in Apple platforms where a malicious web extension may trigger an unexpected process crash.
A use-after-free vulnerability that could allow a malicious web extension to cause an unexpected process crash.
A macOS Tahoe vulnerability in which a malicious web extension may trigger an unexpected process crash via a use-after-free issue.
A use-after-free vulnerability in Apple web content handling that could allow a malicious web extension to cause an unexpected process 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.