Description

This issue was addressed through improved state management. This issue is fixed in 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": "2026-08-17T22:17:25.580Z",
  "pubdate": "2026-08-17T22:17:25.580Z",
  "executiveSummary": "This vulnerability involves a denial of service condition affecting Apple Safari, driven by improper state management during the parsing of maliciously crafted web content. When an end-user processes specially engineered web data via the application, it triggers an unhandled exception or memory corruption state, leading directly to an unexpected application crash. The vulnerability impacts multiple Apple ecosystems, specifically iOS and iPadOS version 26.6.1, and macOS Tahoe version 26.6.2. The risk implication is localized disruption of service, degrading browser availability and user session continuity. An attacker requires the capability to deliver malicious web content to the victim, typically requiring the user to navigate to a compromised or attacker-controlled website. No specific authentication or high-level privileges are required by the threat actor to initiate the attack vector beyond enticing the user to process the adversarial payload.",
  "technicalDetails": "The root cause of the vulnerability stems from inadequate state management within the web content processing engine of Safari. When the rendering engine or associated parsing components encounter maliciously crafted web content designed to manipulate internal state variables outside expected boundaries, the application fails to handle the resulting state transition gracefully. This manifests as a software fault, prompting an unexpected termination or crash of the Safari process.\nThe attack flow initiates when a user accesses a remote web page, HTML document, or resource containing the malicious payload over standard web protocols such as HTTP or HTTPS. Upon retrieval, the vulnerable component parses the structure, scripts, or layout directives. Due to the absence of robust validation or bounds-checking within the state machine governing content rendering, processing the anomalous data structure corrupts internal execution contexts or forces an invalid state.\nThe vulnerable component is tightly coupled with Safari's web rendering and content processing pipeline across iOS, iPadOS, and macOS Tahoe. Network exposure is inherent to the browser's functionality, as it actively retrieves and processes external content from untrusted sources over the internet. Exploitation requires no prior authentication or elevated privileges on the host operating system; the victim simply needs to render the malicious web content within the browser environment. The payload behavior is strictly focused on destabilizing the application runtime, resulting in a denial of service through application termination rather than remote code execution or unauthorized data exfiltration."
}