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CVE-2026-43663 Apple CVE debrief

Apple has addressed a memory handling issue in multiple 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, and watchOS 26.6. The issue could lead to an unexpected process crash when processing maliciously crafted web content. This vulnerability has a CVSS score of 6.5 and is classified as MEDIUM severity. Users of Apple products, particularly those who use Safari or other affected products, should apply the available updates to prevent potential crashes caused by malicious web content.

Vendor
Apple
Product
Safari
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-29
Original CVE updated
2026-07-27
Advisory published
2026-06-29
Advisory updated
2026-07-27

Who should care

Users of Apple products, particularly those who use Safari or other affected products, should apply the available updates to prevent potential crashes caused by malicious web content. This includes administrators and users of affected products, as well as security teams responsible for vulnerability management.

Technical summary

The CVE-2026-43663 vulnerability involves a memory handling issue in various Apple products. This issue can be exploited through maliciously crafted web content, potentially leading to an unexpected process crash. Apple has addressed this vulnerability in the latest versions of their 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, and watchOS 26.6. The CVSS score for this vulnerability is 6.5, indicating a medium severity level.

Defensive priority

Medium priority should be given to applying the available security updates, as the vulnerability can be exploited through web content and has a CVSS score of 6.5.

Recommended defensive actions

  • Apply the available security updates for Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
  • Ensure that all Apple products are updated to the latest versions.
  • Be cautious when visiting untrusted websites or interacting with web content from unknown sources.
  • 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 2026-06-29T20:17:34.773Z and was last modified on 2026-07-27T21:16:52.297Z. The NVD entry is currently Modified. This information is based on the NVD entry and the CVE record. Defenders should verify the affected products and versions, and review the vendor advisory for further details.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-06-29T20:17:34.773Z and has not been modified since then. The NVD entry is currently Modified.