CVE-2026-106379 in Chrome
Summary
by MITRE • 10/07/2026
Uninitialized resource in Skia in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to obtain cross-origin data 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 Skia graphics library, which is integrated into Google Chrome prior to version 155.0.8059.39, represents a significant risk to web application security and user privacy. This flaw stems from improper initialization of memory or data structures used during rendering operations, specifically those handled by Skia when processing complex graphical content on HTML pages. When an attacker crafts a malicious webpage designed to trigger specific rendering paths within the browser engine, they can exploit this uninitialized state to access sensitive information that should be isolated under normal cross-origin policies. The severity of this vulnerability is classified as High by Chromium security standards due to its potential for remote exploitation without user interaction beyond visiting the crafted page.
From a technical perspective, Skia serves as the 2D graphics library responsible for rendering content in Chrome and other applications like Android. When processing certain graphical elements or effects, if internal buffers or state variables are not properly initialized before being read or used in subsequent operations, they may retain residual data from previous processes or contain predictable default values that can be manipulated. In this specific instance, the lack of proper initialization allows an attacker to infer or directly access cross-origin data through side-channel effects or memory disclosure mechanisms inherent in how Skia handles uninitialized resources during rendering. This bypasses standard browser security models such as Same-Origin Policy (SOP), which are designed to prevent scripts from accessing data across different domains unless explicitly permitted by the server via CORS headers.
The operational impact of this vulnerability is severe, primarily affecting user confidentiality and integrity. A remote attacker could construct a webpage that leverages this flaw to exfiltrate sensitive information such as cookies, local storage contents, or other cross-origin resources belonging to legitimate websites visited by the victim. This capability effectively undermines the foundational trust model of modern web browsers, allowing for potential session hijacking, credential theft, or further exploitation through data aggregation. Since the attack vector is remote and requires only a crafted HTML page, it poses a broad threat landscape where any user visiting maliciously designed sites could be compromised without their knowledge or consent.
To mitigate this risk, users are strongly advised to update Google Chrome immediately to version 155.0.8059.39 or later, which includes patches addressing the uninitialized resource handling in Skia. For organizations managing large deployments of browsers, automated patch management systems should be configured to prioritize updates for Chromium-based applications. Additionally, implementing strict Content Security Policy (CSP) headers can help limit the impact of such vulnerabilities by restricting the sources from which scripts and resources are loaded, thereby reducing the attack surface available to potential exploiters. Monitoring browser logs for unusual rendering behaviors or memory access patterns may also aid in detecting attempted exploitation activities before significant damage occurs.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-457, which describes use of uninitialized variable, and falls under MITRE ATT&CK technique T1005, indicating data from local system extraction via browser-based methods. Addressing these types of low-level memory management errors is critical for maintaining the integrity of web browsing environments and ensuring that cross-origin isolation mechanisms function as intended against sophisticated remote attacks.