Description

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "3.1",
  "pubDate": "2026-08-17T22:17:23.180Z",
  "pubdate": "2026-08-17T22:17:23.180Z",
  "executiveSummary": "A memory corruption vulnerability has been identified within multiple Apple operating systems, specifically stemming from inadequate locking mechanisms during the processing of web content. This flaw can be triggered when a user processes maliciously crafted web content within the affected ecosystem, directly resulting in an unexpected application crash of Safari.\nThe vulnerability impacts a broad range of Apple products, including iOS 18.7.10, iPadOS 18.7.10, iOS 26.6.1, iPadOS 26.6.1, and macOS Tahoe 26.6.2. The risk implications primarily involve localized denial-of-service conditions affecting the Safari browser component, degrading system reliability and disrupting user operations.\nAn attacker possessing the capability to construct and deliver maliciously crafted web content can induce exploitation. The exploitation requirements typically involve coercing a targeted user into navigating to or processing the malicious web content through Safari. Due to the lack of explicit authentication or elevated privilege prerequisites for web-based ingestion, successful execution relies entirely on the successful rendering of the malicious payload by the vulnerable web processing engine.\nOrganizations and end-users must apply the officially provided software updates to remediate the underlying locking deficiencies and restore robust memory safety protocols across all deployed instances of the affected operating systems.",
  "technicalDetails": "The vulnerability is fundamentally classified as a memory corruption flaw resulting from improper synchronization and concurrency control within the affected codebase. The root cause originates from inadequate locking mechanisms during multi-threaded or asynchronous processing routines utilized when parsing and rendering web content.\nThe vulnerable component resides within the web content processing pipeline of Safari, where concurrent access to shared memory resources lacks sufficient mutual exclusion guarantees. Consequently, race conditions or unauthorized concurrent read and write operations can occur when handling specially crafted data structures embedded within malicious web content.\nThe attack flow begins when a user is exposed to maliciously crafted web content, typically delivered via a remote web server controlled by an attacker or through compromised third-party advertisements. Upon ingestion, the Safari rendering engine initiates parsing routines that trigger the flawed memory management and synchronization logic. Because the locking mechanisms are insufficient to serialize access safely, memory corruption manifests in the form of invalid state transitions, dangling pointers, or concurrent modification anomalies.\nRegarding execution constraints, the attack does not require prior authentication or elevated privileges. Network exposure is inherent to standard web browsing capabilities, as the vector relies on the processing of arbitrary web content accessible via standard HTTP or HTTPS protocols. The payload behavior centers on disrupting memory integrity, which subsequently precipitates an unhandled exception or critical assertion failure, manifesting as an unexpected application crash.\nThe post-exploitation impact described is constrained to application instability, specifically a denial-of-service condition affecting Safari. The affected versions explicitly encompass iOS 18.7.10, iPadOS 18.7.10, iOS 26.6.1, iPadOS 26.6.1, and macOS Tahoe 26.6.2. Remediation efforts focus on augmenting the internal locking architecture to ensure atomic operations and strict synchronization boundaries across all data manipulation phases within the web processing engine."
}