CVE-2026-58287 in Edge
Summary
by MITRE • 07/04/2026
Use after free in Microsoft Edge (Chromium-based) allows an unauthorized attacker to execute code over a network.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 07/04/2026
This vulnerability represents a critical use-after-free condition within Microsoft Edge's chromium-based rendering engine that enables remote code execution through network-based attacks. The flaw occurs when the browser processes certain web content that triggers improper memory management during object deallocation, creating a scenario where freed memory locations can be accessed and reused by malicious code. Attackers can exploit this weakness by crafting specially crafted web pages or web applications that manipulate the browser's memory allocation patterns to execute arbitrary code with the privileges of the Edge process. The vulnerability stems from inadequate validation mechanisms within the browser's memory management subsystem, specifically affecting how JavaScript objects and DOM elements are handled during garbage collection cycles. This issue falls under the common weakness enumeration CWE-416 which catalogs use-after-free vulnerabilities as a fundamental class of memory safety errors that can lead to arbitrary code execution.
The operational impact of this vulnerability extends beyond simple remote code execution to encompass complete system compromise when attackers leverage additional attack vectors such as browser exploitation frameworks or social engineering techniques. An attacker who successfully exploits this vulnerability gains the ability to execute malicious payloads with the same privileges as the Edge browser process, potentially allowing for privilege escalation, data exfiltration, or installation of persistent backdoors on affected systems. The network-based nature of the exploit means that victims can be compromised through simple web browsing activities without requiring any special user interaction beyond visiting a malicious website. This makes the vulnerability particularly dangerous in enterprise environments where users may inadvertently encounter compromised web content during routine browsing activities.
Security professionals should implement multiple layers of defense when addressing this vulnerability, beginning with immediate deployment of Microsoft security updates and patches that address the underlying memory management flaw. Network segmentation and web filtering solutions can provide additional protection by blocking access to known malicious domains or implementing sandboxing techniques that isolate potentially dangerous web content. Browser hardening measures including disabling unnecessary JavaScript features, implementing strict content security policies, and deploying exploit prevention technologies such as address space layout randomization and data execution prevention can significantly reduce the attack surface. Organizations should also consider implementing advanced threat detection systems that monitor for anomalous memory access patterns or unusual browser behavior that might indicate exploitation attempts. From an att&ck framework perspective, this vulnerability maps to techniques such as t1203 legitimate program proxy execution and t1059 command and scripting interpreter, where attackers leverage the browser as a launchpad for further system compromise. Regular security assessments and penetration testing should focus on identifying potential attack paths that could lead to exploitation of similar memory corruption vulnerabilities within the browser ecosystem.