CVE-2026-43718 Apple CVE debrief

Who should care

Users of Apple products, particularly those using Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, should apply the latest security updates to prevent potential crashes from maliciously crafted web content. IT administrators and security teams responsible for managing Apple devices should prioritize patching and review their current security practices.

Technical summary

The CVE-2026-43718 vulnerability involves a stack overflow issue that can be triggered by processing maliciously crafted web content, potentially leading to an unexpected Safari crash. Apple has addressed this issue through improved input validation in the affected products, including Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Limited technical details are available from the CVE and NVD records.

Defensive priority

Medium priority for users of affected Apple products, especially those exposed to untrusted web content.

Recommended defensive actions

• Apply the latest security updates for Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
• Implement general security best practices when browsing the web, especially on untrusted sites.
• Ensure that all Apple products are updated to the latest versions.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record was published on 2026-06-29T20:17:36.457Z and was last modified on 2026-07-27T21:16:56.023Z. The NVD entry is currently Modified. This issue is related to a stack overflow vulnerability addressed with improved input validation in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Limited evidence is available from the CVE and NVD records.

Official resources