CVE-2023-43000 Apple Multiple products Use-After-Free Vulnerability
Apple macOS, iOS, iPadOS, and Safari 16.6 contain a use-after-free vulnerability due to the processing of maliciously crafted web content that may lead to memory corruption.
From the CISA KEV catalogue version 2026.11.06, with Cybergen analysis. Updated 6 Nov 2026.
Should You Worry?
- CISA confirmed exploitation in the wild and added it to the Known Exploited Vulnerabilities catalogue on 5 Mar 2026.
- Rated High severity (CVSS 8.8, scored by CISA).
- It has been in the catalogue for 246 days. Systems still unpatched now have almost certainly been scanned for it.
What It Is
A use-after-free issue was addressed with improved memory management. This issue is fixed in macOS Ventura 13.5, iOS 16.6 and iPadOS 16.6, Safari 16.6, iOS 15.8.7 and iPadOS 15.8.7. Processing maliciously crafted web content may lead to memory corruption.
Affected Versions
| Product | Versions |
|---|---|
| Apple macOS | unspecified to before 13.5 |
| Apple iOS and iPadOS | unspecified to before 16.6 |
| Apple Safari | unspecified to before 16.6 |
| Apple iOS and iPadOS | unspecified to before 15.8.7 |
From the public CVE record, as supplied by the vendor. Always confirm against the vendor advisory.
What To Do Now
- 1
Find it
Search your asset inventory and external attack surface for Apple Multiple Products. Include cloud images, appliances and anything a supplier runs for you.
Attack Surface Management - 2
Fix it
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Vulnerability Management - 3
Hunt for compromise
If an affected system was reachable before you patched, assume it may have been hit. Check logs, new accounts, web shells and outbound connections from the date of exposure.
Incident Response - 4
Prove it is fixed
Rescan or test the system after patching. Upgrades that fail silently and forgotten secondary instances are common.
Penetration Testing
The Compliance Clock
General guidance, not legal advice. Your obligations depend on your sector, scope and jurisdiction.
Not Sure If You Are Exposed?
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