CVE-2026-64784 in iOS
Summary
by MITRE • 08/18/2026
An out-of-bounds access issue was addressed with improved bounds checking. 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.
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Analysis
by VulDB Data Team • 08/18/2026
The vulnerability described constitutes a critical memory safety defect within the WebKit rendering engine, specifically manifesting as an out-of-bounds access condition. This type of flaw typically arises when software reads or writes data outside the boundaries of allocated memory buffers, often due to insufficient validation of array indices or pointer arithmetic during the processing of complex web content. In this specific instance, the root cause is traced back to inadequate bounds checking mechanisms within Safari's handling of maliciously crafted HTML, CSS, or JavaScript payloads. When a user navigates to a webpage containing such exploit code, the browser attempts to process elements that trigger memory access violations, leading to an immediate and unexpected crash of the application rather than graceful error handling or secure failure modes.
From a technical perspective, this issue aligns with CWE-125, which defines Out-of-bounds Read vulnerabilities where software reads data past the end, or before the beginning, of the intended buffer. While the immediate observable impact is a denial of service through application crash, out-of-bounds access issues are frequently precursors to more severe security compromises if they can be leveraged for arbitrary code execution. Attackers may attempt to exploit these memory corruption flaws to achieve information disclosure by reading sensitive data from adjacent memory regions or potentially escalate privileges if the vulnerability allows for controlled overwrites of critical program structures such as function pointers or exception handlers. The ATT&CK framework categorizes this under T1499, Endpoint Denial of Service, specifically noting techniques that exploit software vulnerabilities to disrupt service availability on targeted systems.
The operational impact of this vulnerability is primarily centered around the stability and reliability of Safari across Apple's ecosystem. For end-users, encountering a maliciously crafted website results in an abrupt termination of the browser session, which can lead to data loss if unsaved work was present or create a frustrating user experience that undermines trust in the platform's security posture. From an enterprise perspective, this vulnerability could be weaponized for targeted denial-of-service attacks against employees using Safari on iOS and macOS devices, potentially disrupting productivity during critical operations. Furthermore, because web content is ubiquitous, the attack surface is broad, allowing threat actors to distribute exploits via phishing campaigns or compromised legitimate websites without requiring any user interaction beyond visiting a URL.
Apple has addressed this issue by implementing improved bounds checking logic within the WebKit engine in recent updates. The fix ensures that memory accesses are strictly validated against allocated buffer limits before execution proceeds, thereby preventing the out-of-bounds read condition from occurring. To mitigate the risk associated with this vulnerability, organizations and individual users must ensure their devices are updated to iOS 18.7.10 or later, iPadOS 18.7.10 or later, macOS Tahoe 26.6.2 or later, as well as the specified versions of iOS 26.6.1 and iPadOS 26.6.1 where applicable. It is also recommended to enable automatic security updates on mobile devices to ensure timely patching against such web-based threats. Additionally, users should exercise caution when clicking links from untrusted sources and consider using browser extensions or enterprise mobility management solutions that enforce stricter content security policies to reduce exposure to malicious web payloads.