CVE-2026-106258 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 • 10/07/2026
The vulnerability identified as an uninitialized resource issue within the ANGLE graphics library, which is integrated into Google Chrome on Windows prior to version 155.0.8059.39, represents a significant breach in memory safety and sandbox integrity. ANGLE serves as a critical translation layer that converts OpenGL ES API calls into native platform-specific graphics APIs such as DirectX or Vulkan. This architectural role places it at the intersection of web rendering and system-level resource management, making any flaw within its codebase potentially exploitable for severe security violations. The specific nature of this vulnerability involves an uninitialized memory state where a resource pointer or variable is accessed before being properly assigned a valid value by the application logic. In C++ based environments like Chromium, accessing such uninitialized data can lead to undefined behavior, often resulting in the reading of arbitrary memory locations that contain sensitive information from other processes or internal browser structures.
From a technical perspective, this flaw falls under the category of improper initialization of variables and pointers, which is formally classified as CWE-457: Use of Uninitialized Variable. When an attacker crafts a malicious HTML page containing specific JavaScript code designed to trigger particular rendering paths within ANGLE, they can manipulate the execution flow to reach the point where the uninitialized resource is accessed. Because Chrome employs a multi-process architecture with strict sandboxing mechanisms intended to isolate web content from the operating system and user data, this vulnerability poses a direct threat to that isolation model. The ability to read memory outside the sandbox indicates that the attacker has achieved arbitrary read access beyond the restricted boundaries imposed on the renderer process. This capability allows for the exfiltration of sensitive data such as cookies, session tokens, autofill information, or other credentials stored in memory by higher-privilege processes.
The operational impact of this vulnerability is severe due to its potential for remote code execution and privilege escalation through information disclosure. Although the initial description highlights a read-only capability, arbitrary memory reads are frequently used as a stepping stone for more complex attacks such as heap spraying or type confusion exploits that can lead to full system compromise. The Chromium security team has classified this issue with a High severity rating, reflecting its potential to bypass critical security controls and expose user data to remote adversaries. Attackers would need to lure victims into visiting the crafted HTML page, typically via phishing campaigns or malicious advertisements, but once executed within an affected browser version, the consequences can be catastrophic for individual privacy and organizational security postures.
To mitigate this risk, users must ensure that Google Chrome is updated to version 155.0.8059.39 or later immediately upon availability. This update contains patches that properly initialize all resources within the ANGLE translation layer before they are accessed during rendering operations. For organizations managing large fleets of devices, deploying this patch through centralized endpoint management systems is essential to close the window of exposure. Additionally, security teams should monitor for indicators of compromise related to memory scraping techniques and ensure that browser hardening policies restrict unnecessary JavaScript execution where feasible. From a defensive engineering standpoint, integrating static analysis tools capable of detecting uninitialized variable usage into the development pipeline can help prevent similar flaws in future releases. This incident also underscores the importance of continuous integration testing against fuzzing targets for graphics libraries like ANGLE to catch edge cases that manual code review might miss. The ATT&CK framework categorizes this type of exploitation under T1074: Data Staged, as the attacker stages stolen data by reading it from memory before exfiltration, highlighting the need for robust endpoint detection and response capabilities to identify anomalous memory access patterns originating from browser processes.