PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-43704 Apple CVE debrief

A use-after-free issue was addressed with improved memory management. 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 has a CVSS score of 5.3 and is classified as MEDIUM severity. A malicious web extension may be able to cause an unexpected process crash. 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 caused by malicious web extensions.

Vendor
Apple
Product
Safari
CVSS
MEDIUM 5.3
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 caused by malicious web extensions. Security teams and administrators responsible for managing these systems should prioritize applying the security updates and monitor system logs for unexpected process crashes.

Technical summary

The CVE-2026-43704 vulnerability is a use-after-free issue that was addressed with improved memory management in various Apple products. 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, and watchOS 26.6. A malicious web extension may be able to cause an unexpected process crash. The vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity.

Defensive priority

Medium priority should be given to applying the security updates, as the vulnerability has a CVSS score of 5.3 and is classified as MEDIUM severity.

Recommended defensive actions

  • Apply the latest security updates for Safari, iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
  • Restrict the installation of web extensions to only those from trusted sources.
  • Monitor system logs for unexpected process 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 2026-06-29T20:17:35.367Z and was last modified on 2026-07-27T21:16:54.090Z. The NVD entry is currently Modified. This use-after-free issue was addressed with improved memory management in various Apple products. A malicious web extension may be able to cause an unexpected process crash. 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, and watchOS 26.6.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43704 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43704

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

  • CVE-2026-43704 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43704

    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.