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PatchSiren cyber security CVE debrief

CVE-2026-43699 Apple CVE debrief

A use-after-free issue was addressed with improved memory management in Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. This issue can lead to an unexpected process crash when processing maliciously crafted web content. The vulnerability affects users of Apple products and has been addressed 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, and watchOS 26.6.

Vendor
Apple
Product
Safari
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-29
Original CVE updated
2026-08-17
Advisory published
2026-06-29
Advisory updated
2026-08-17

Who should care

Users of Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS should apply the updates to prevent potential crashes from processing maliciously crafted web content. This includes operators, security teams, and vulnerability management teams responsible for maintaining these systems.

Technical summary

The CVE-2026-43699 vulnerability is a use-after-free issue in Apple Safari that can lead to an unexpected process crash when processing maliciously crafted web content. This issue was addressed with improved memory management 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, and watchOS 26.6. Affected users should apply the updates to prevent potential crashes.

Defensive priority

Medium priority due to the potential for crashes and the availability of patches. Users should prioritize applying the updates to prevent potential crashes.

Recommended defensive actions

  • Apply 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 updates
  • Restrict access to untrusted web content
  • Monitor for unusual browser crashes
  • 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 2026-06-29T20:17:34.970Z and was last modified on 2026-07-27T21:16:53.463Z. The NVD entry is currently Modified. This use-after-free issue affects Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS. Defenders should verify affected product deployments and apply updates or mitigations accordingly.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43699 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43699

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-43699 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43699

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.