CVE-2026-106184 in Chrome
Summary
by MITRE • 10/06/2026
Uninitialized resource in Media 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 • 10/06/2026
The vulnerability identified as an uninitialized resource issue within the media subsystem of Google Chrome, specifically in versions prior to 155.0.8059.39, represents a significant breach of browser isolation principles. This flaw stems from improper initialization of memory or state variables associated with multimedia processing components. When the browser processes specific media-related operations, it fails to properly set up internal data structures before they are accessed by subsequent code paths. This oversight creates a window where sensitive information stored in uninitialized memory regions can be read out-of-bounds or exposed through unintended channels. The severity is classified as high because this type of error directly undermines the security model that prevents web content from accessing resources belonging to other origins, which is fundamental to preventing data leakage across different websites and applications running within the same browser instance.
From a technical perspective, uninitialized memory vulnerabilities often lead to information disclosure or can be chained with other flaws to achieve arbitrary code execution. In this context, the lack of proper initialization allows an attacker who controls a crafted HTML page to manipulate how the media engine handles data buffers. By carefully constructing input that triggers specific rendering or decoding paths, the attacker can cause the browser to expose memory contents that should remain isolated within the cross-origin boundary. This effectively breaks the same-origin policy, allowing malicious scripts embedded in one origin to read sensitive data from another origin, such as cookies, session tokens, or private user information displayed on a different website loaded in the same tab or window.
The operational impact of this vulnerability is severe for end-users and organizations relying on Chrome for secure web browsing. An attacker can host a malicious webpage designed to exploit this flaw when visited by an unsuspecting victim. Upon loading, the crafted page triggers the uninitialized resource condition within the media component, leading to the exfiltration of cross-origin data. This could result in account takeovers if session identifiers are leaked, or privacy violations through the exposure of personal documents and communications viewed on other sites. The ability to bypass origin checks means that traditional defenses like Content Security Policy may be insufficient if they rely solely on same-origin assumptions without considering side-channel leaks via uninitialized memory states.
This vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-457, which describes the use of an uninitialized variable or resource. It also maps to MITRE ATT&CK techniques related to Discovery and Collection, specifically those involving browser-based data theft such as T1005 (Data from Local System). The exploitation vector is remote via a web page, falling under Attack Vector Network with low complexity but requiring user interaction in the form of visiting the malicious site. Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later where these initialization checks have been corrected by Chromium developers. Additionally, users should enable automatic update notifications and consider deploying browser isolation technologies or sandboxing solutions that limit the potential impact of any successful exploitation attempt within a single tab process.