When Apple released its security notes for the update, it did not indicate whether any of the flaws were zero-days—in other words, whether any of the flaws had been exploited or publicly disclosed before a patch was readily available. That puts the user at an advantage, since it suggests bad actors haven't figured out how to take advantage of any of the now-fixed flaws. However, as it turns out, one of these flaws was actively exploited—just not against an Apple product.
While Apple says this vulnerability was not exploited against Apple software, at least at the time the release notes were published, one piece of software that appears to have been actively exploited using this flaw is Google Chrome. As reported by Bleeping Computer, CVE-2025-6558 can allow bad actors to run their own code within Chrome's GPU process when visiting malicious websites. This could enable hackers to break into the operating system of the target's machine. If you're using an Apple product, that would mean iOS, macOS, iPadOS, tvOS, visionOS, or watchOS could be compromised from this attack. (Apple released security updates for all of these OSes, respectively.)
Protecting your devices from this zero-day
To make sure you protect your devices from this vulnerability, you'll want to update all affected hardware and software. That means you'll want to update any Apple devices to iOS 18.6, and if you use Chrome or a Chromium-based browser (like Microsoft Edge or Opera) you'll want to update it to the latest version.
General > Software Update. On Chrome, click the three dots in the top right, then go to Help > About Google Chrome.
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