CVE-2025-43529 Apple Multiple Products: memory-safety flaw
In plain words: The program mishandles the memory it uses to keep track of data. A specially made input can scramble that memory. Usually lets an attacker crash the program or run their own code with its permissions.
Confirmed exploited by CISA on · US federal patch deadline Jan 5, 2026
What to do
- Install Apple's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
- Keep extensions to a minimum and remove ones you do not recognise.
- Stop using Internet Explorer and any browser that no longer gets updates.
Who is affected
Could reach you. This one is aimed at devices or apps of the kind people own.
What's at risk: A malicious or hacked website can be enough. Browser bugs are often the first step in a longer attack on the whole computer or phone.
The details
- Official name
- Apple Multiple Products Use-After-Free WebKit Vulnerability
- Product
- Apple Multiple Products
- CISA description
- Apple iOS, iPadOS, macOS, and other Apple products contain a use-after-free vulnerability in WebKit. Processing maliciously crafted web content may lead to memory corruption. This vulnerability could impact HTML parsers that use WebKit, including but not limited to Apple Safari and non-Apple products which rely on WebKit for HTML processing.
- Type of flaw
- Memory-safety flaw (CWE-416)
- Confirmed exploited
- Dec 15, 2025
- US federal patch deadline
- Jan 5, 2026
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Answering about CVE-2025-43529 ·
Questions about CVE-2025-43529
Is CVE-2025-43529 being exploited?
Yes. CISA added CVE-2025-43529 to its Known Exploited Vulnerabilities catalog on Dec 15, 2025, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-43529?
Install Apple's security update for Multiple Products. If no update exists, follow the vendor's workaround or stop using the product until one ships. Let the browser auto-update and relaunch it when it asks — the fix is not active until you do.
Am I affected by CVE-2025-43529?
Only if you use Apple Multiple Products. This one is aimed at devices or apps of the kind people own.