CVE-2026-106202 in Chrome
Summary
by MITRE • 10/06/2026
Uninitialized resource in ANGLE in Google Chrome on on Windows prior to 155.0.8059.39 allowed a remote attacker to read memory outside the sandbox via a crafted HTML page. (Chromium security severity: High)
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an uninitialized resource issue within the ANGLE graphics library in Google Chrome for Windows represents a significant breach of browser isolation boundaries, specifically allowing unauthorized access to protected memory regions. This flaw stems from improper initialization practices where system resources or data structures are accessed before being properly set up with valid values or allocated state. In the context of modern web browsers, such errors can have severe consequences because they undermine the fundamental security model that separates untrusted web content from sensitive host system information. The specific impact here involves a remote attacker leveraging this flaw to read memory outside the sandbox environment, which is designed to restrict what web pages and scripts can access on the underlying operating system.
ANGLE serves as an abstraction layer in Google Chrome that translates OpenGL ES API calls into native graphics APIs such as DirectX or Vulkan for Windows systems. By functioning as a bridge between high-level rendering commands and low-level hardware interfaces, ANGLE handles complex graphical operations required by modern web applications. When this component fails to initialize resources correctly, it may leave pointers or memory addresses in an undefined state. If the browser logic subsequently attempts to dereference these uninitialized pointers without validation, it can result in out-of-bounds reads. This behavior allows data from adjacent memory locations to be exposed to the executing JavaScript context within a webpage.
The operational impact of this vulnerability is particularly critical due to its potential for sandbox escape. The Chrome sandbox restricts processes running web content from accessing sensitive parts of the operating system, such as file systems or other application memories. By exploiting an uninitialized resource that leads to out-of-bounds memory reads, an attacker can potentially leak information about the browser's internal state, including pointers used by security mechanisms like ASLR (Address Space Layout Randomization). This leakage reduces the entropy required for effective address randomization, thereby facilitating further exploitation steps aimed at achieving arbitrary code execution. Although the immediate effect is a read operation, it serves as a stepping stone toward more severe compromises of user privacy and system integrity.
From a classification perspective, this vulnerability aligns with CWE-457, which describes the use of an uninitialized variable or resource. This category encompasses scenarios where memory is allocated but not zeroed out or assigned initial values before being used in logic that depends on those values. Furthermore, the exploitation technique relates to ATT&CK T1083, specifically File and Directory Discovery, as well as potential data exfiltration techniques under Data from Local System. The ability to read arbitrary memory locations enables attackers to gather intelligence about the target environment, which is a common precursor to privilege escalation or persistent access establishment in advanced threat scenarios.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where this issue has been addressed through code fixes that ensure proper initialization of resources within the ANGLE library. Developers and security teams should also enforce strict memory management practices in software development life cycles, particularly when dealing with graphics libraries and low-level API interactions. Implementing static analysis tools capable of detecting uninitialized variable usage can help identify such flaws during the coding phase rather than after deployment. Additionally, maintaining up-to-date antivirus signatures and endpoint detection systems may provide some level of protection against exploitation attempts by identifying suspicious memory access patterns associated with sandbox escape techniques.