Description

The issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.10 and iPadOS 18.7.10. Processing maliciously crafted web content may lead to an unexpected Safari crash.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "4.3",
  "pubDate": "2026-08-17T22:17:04.010Z",
  "pubdate": "2026-08-17T22:17:04.010Z",
  "executiveSummary": "An issue related to memory handling within Safari has been identified, which can be exploited through the processing of maliciously crafted web content.\nThe primary impact of this vulnerability is an unexpected application crash, resulting in a denial of service condition for the Safari browser.\nThe affected systems include iOS and iPadOS, specifically prior to version 18.7.10.\nThe risk implications are primarily associated with service disruption and potential loss of user session data when the browser unexpectedly terminates.\nAn attacker possesses the capability to trigger this vulnerability by deploying specially crafted web content designed to exploit memory mismanagement.\nSuccessful exploitation requires a victim to process the malicious web content, typically by navigating to a compromised website or rendering untrusted HTML data.",
  "technicalDetails": "The vulnerability stems from improper memory handling within the Safari web rendering engine when parsing and processing untrusted web content.\nThe root cause is an unhandled memory condition or invalid memory access operation triggered by malformed structures within maliciously crafted web payloads.\nThe vulnerable component resides within the memory management subsystems responsible for allocating, referencing, or freeing heap objects during the parsing of web assets.\nAffected software versions include iOS and iPadOS prior to version 18.7.10, where the underlying memory handling defect remains unpatched.\nThe attack vector is network-based, requiring the delivery of maliciously crafted web content via HTTP or HTTPS protocols to the target device.\nNo explicit authentication or privilege requirements are necessary for an external actor to host the malicious content, and the victim requires no special privileges to encounter the trigger condition.\nThe step-by-step attack flow begins when an attacker hosts or distributes maliciously crafted web content designed to exploit memory allocation discrepancies.\nNext, the user navigates to the malicious resource using the Safari browser on an unpatched iOS or iPadOS device.\nAs Safari parses the incoming stream, the rendering engine encounters the malformed data structures that induce improper memory operations.\nDue to the lack of robust bounds checking or safe memory reclamation routines, the application encounters an unhandled exception or memory fault.\nThis anomalous behavior immediately forces an unexpected Safari crash, terminating the process and disrupting the user session.\nPost-exploitation impact is constrained to a localized denial of service of the Safari application, as the memory corruption is handled by the operating system's process termination protocols, preventing further execution flow hijacking based on the provided data."
}