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CVE-2026-43704 is a use-after-free vulnerability in Apple Web Extensions. The flaw stems from improper memory lifecycle handling in the Web Extensions component and was addressed through improved memory management. Successful triggering of the stale pointer condition by a malicious web extension can destabilize the affected process and result in an unexpected process crash. Apple reports fixes in Safari 26.5.2, iOS 26.5.2, iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, 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.
9 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 Web Extensions vulnerability where a malicious web extension may be able to cause 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.
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.