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CVE-2026-43718 Apple CVE debrief

A stack overflow vulnerability was addressed with improved input validation. 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 can be triggered by processing maliciously crafted web content, potentially leading to an unexpected Safari crash. Users of affected Apple products 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 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.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43718 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43718

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

  • CVE-2026-43718 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43718

    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.