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PatchSiren cyber security CVE debrief

CVE-2026-43742 Apple CVE debrief

A use-after-free issue was addressed with improved memory management in Safari. This issue is fixed 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. The vulnerability could lead to an unexpected process crash when processing maliciously crafted web content. Users of Apple products, particularly those using Safari, should apply the latest security updates to prevent potential crashes.

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 using Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS, should apply the latest security updates to prevent potential crashes from processing maliciously crafted web content. IT administrators and security teams responsible for managing Apple products should prioritize updating these systems to the latest versions.

Technical summary

A use-after-free issue in Safari was addressed with improved memory management. The issue could lead to an unexpected process crash when processing maliciously crafted web content. Fixes are included 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. This vulnerability is related to memory management in Safari, and defenders should focus on updating Safari and related Apple products to the latest versions.

Defensive priority

Medium priority due to the potential for process crashes from malicious web content. Defenders should focus on updating vulnerable systems and implementing compensating controls.

Recommended defensive actions

  • Apply the latest security updates for Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
  • Implement compensating controls such as web content filtering and monitoring.
  • Ensure that all Apple products are running the latest software versions.
  • Review and verify affected product deployments in managed environments.
  • 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.
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

The CVE record was published on 2026-06-29T20:17:37.690Z and was last modified on 2026-07-27T21:16:58.783Z. The NVD entry is currently Modified. This issue is related to a use-after-free vulnerability in Safari, which could lead to an unexpected process crash when processing maliciously crafted web content. The issue is fixed 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. Defenders should verify affected product deployments, review official advisories, and plan vendor-supported updates or mitigations.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-06-29T20:17:37.690Z and has not been modified since then. The NVD entry is currently Modified.