Description

A memory corruption issue was addressed with improved state management. 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": "4.3",
  "pubDate": "2026-08-17T22:17:24.330Z",
  "pubdate": "2026-08-17T22:17:24.330Z",
  "executiveSummary": "A memory corruption vulnerability exists in the state management mechanisms responsible for processing web content across multiple Apple operating systems. Exploitation of this flaw allows an attacker to cause an unexpected application crash of the Safari browser when a victim processes maliciously crafted web content. The affected products include iOS and iPadOS versions prior to 18.7.10 and 26.6.1, as well as macOS Tahoe versions prior to 26.6.2. The risk implication involves potential denial of service scenarios affecting the browser component. Attacker capabilities rely on the ability to deliver malicious web content, typically requiring the user to navigate to a compromised or maliciously constructed website or rendering context. Specific exploitation requirements dictate that the victim must process the crafted web content via the vulnerable Safari engine, triggering the improper state handling flaw within the memory management subsystem.",
  "technicalDetails": "The vulnerability stems from a memory corruption defect residing within the state management architecture responsible for handling dynamic web content. When the affected software processes maliciously crafted web content, internal state tracking fails to properly validate or manage object lifecycles and memory allocations, resulting in unsafe memory operations. The vulnerable component is tightly integrated into the web rendering and processing engine utilized by Safari.\nExploitation occurs when an unauthenticated attacker delivers a specially crafted payload disguised as standard web content, such as HTML, JavaScript, or associated DOM elements, directly to the victim's browser. No authentication or elevated privileges are required to initiate the attack vector, and the network exposure is inherent to any standard web browsing activity. Upon ingestion of the malicious input, the parsing and rendering engine enters an inconsistent operational state due to inadequate bounds or state validation.\nThe step-by-step attack flow proceeds as follows: First, the user navigates to an attacker-controlled web page or encounters malicious web content injected via a compromised third-party site. Second, the Safari browser parses the incoming data structures, handing off the payload to the vulnerable state management subsystem. Third, the flawed logic mishandles the structural transitions or memory references, triggering a memory corruption condition such as a use-after-free or invalid pointer dereference. Finally, the exception handling mechanisms fail to recover safely, resulting in an unexpected termination and crash of the Safari process, manifesting as a localized denial of service condition. Post-exploitation impact documented in the specification is limited to application instability and unexpected crashes of the affected browser instances."
}