CVE-2026-106248 in Chrome
Summary
by MITRE • 10/06/2026
Use after free in Bindings in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as a use-after-free error within the JavaScript bindings of Google Chrome prior to version 155.0.8059.39 represents a critical memory management flaw that undermines the browser's sandboxing mechanisms. This specific class of defect occurs when an application continues to reference a pointer after the memory it points to has been freed, leading to undefined behavior that can be exploited by malicious actors. In this instance, the vulnerability resides in the bindings layer, which serves as the interface between the JavaScript engine and the underlying C++ components of the browser. When a crafted HTML page triggers specific sequences involving these bindings, the application fails to properly manage the lifecycle of certain objects, allowing access to memory that has already been deallocated by the system.
From a technical perspective, this flaw aligns with CWE-416, which describes use after free vulnerabilities where an object is accessed after its lifetime has ended. The exploitation vector involves a remote attacker hosting or distributing a specially crafted HTML page designed to trigger the premature release of memory while retaining references to that same memory region. By carefully controlling the allocation and deallocation patterns within the JavaScript environment, an attacker can manipulate the freed memory block to contain malicious data structures. When the browser subsequently attempts to access these dangling pointers, it interprets the attacker-controlled content as valid code or instructions, thereby facilitating arbitrary code execution.
The operational impact of this vulnerability is severe due to its potential for remote code execution within the sandboxed environment of Chrome. Although modern browsers employ multiple layers of defense such as site isolation and hardware-enforced stack protection, a successful exploitation of this use-after-free condition can allow an attacker to bypass these safeguards. This enables the execution of arbitrary commands with the privileges of the browser process, potentially leading to full system compromise if further escalation techniques are employed. The severity rating of High by Chromium reflects the likelihood of exploitability and the significant risk posed to users who visit malicious websites or click on compromised links containing such crafted payloads.
This incident is also relevant to MITRE ATT&CK framework tactics involving initial access and execution, specifically mapping to techniques that leverage browser vulnerabilities for drive-by downloads or script injection. To mitigate this risk, organizations must ensure that all instances of Google Chrome are updated to version 155.0.8059.39 or later immediately upon availability. Additionally, users should maintain strict browsing hygiene by avoiding untrusted websites and utilizing security extensions that block potentially malicious scripts. For developers integrating similar binding mechanisms in other applications, it is imperative to implement rigorous memory management practices, including smart pointers and reference counting checks, to prevent dangling pointer dereferences and ensure the integrity of the execution environment.