CVE-2026-96192 in Edge
Summary
by MITRE • 10/29/2026
Use after free in Microsoft Edge for iOS allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability described constitutes a critical use-after-free flaw within the Microsoft Edge browser engine specifically affecting the iOS platform. This type of memory corruption error occurs when software continues to use a pointer after it has been freed, leading to undefined behavior that can be exploited by malicious actors. In the context of web browsers like Microsoft Edge for iOS, which rely heavily on complex rendering engines and JavaScript interpreters, such flaws are particularly dangerous because they allow attackers to manipulate how memory is allocated and accessed during page loading or script execution. The core technical flaw involves a scenario where an object in memory is deallocated but remains referenced by another part of the application. When the attacker triggers this dangling pointer through crafted web content, the browser may interpret the freed memory as valid data, potentially allowing for arbitrary code execution within the context of the browser process.
From a security architecture perspective, this vulnerability aligns with CWE-416, which defines use after free errors where references to memory are used after it has been freed. The operational impact is severe because successful exploitation enables an unauthorized attacker to execute arbitrary code over a network without any user interaction beyond visiting a maliciously crafted website or clicking on a link containing exploit code. This capability effectively bypasses the browser's sandboxing mechanisms, granting the attacker control over the application process running on the iOS device. Depending on the privileges under which the browser operates, this could lead to full system compromise if additional vulnerabilities are chained together, although typically it results in arbitrary code execution within the isolated browser container.
This exploit vector is consistent with techniques documented in the MITRE ATT&CK framework, specifically falling under T1203 Exploitation for Client Execution and potentially leveraging memory corruption primitives often associated with heap spraying or exploitation of JavaScript engines like V8 or Chakra depending on the specific version components involved. The network-based nature of this attack means that remote attackers can target users simply by directing them to a malicious URL, making it a high-risk threat in environments where users frequently browse untrusted websites.
Mitigation strategies primarily involve applying the latest security patches released by Microsoft for Microsoft Edge on iOS. These updates typically include fixes that ensure proper memory management practices are enforced, such as nullifying pointers after deallocation or implementing stricter checks to prevent access to freed memory regions. Additionally, organizations should enforce strict content security policies and utilize browser hardening features where available to limit the impact of potential exploits. Users must be educated on the risks of visiting untrusted sites, although technical controls remain the primary defense against such automated network-based attacks. Regular maintenance of mobile applications is critical as vendors continuously address these low-level memory safety issues through rigorous code audits and fuzzing efforts designed to detect use-after-free conditions before they reach production builds.