CVE-2026-106392 in Chrome
Summary
by MITRE • 10/07/2026
Information leak in WebAudio in Google Chrome prior to 155.0.8059.39 allowed a remote attacker to potentially leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an information leak within the WebAudio API of Google Chrome versions prior to 155.0.8059.39 represents a significant breach in browser isolation mechanisms, specifically targeting cross-origin data protection. This flaw allows a remote attacker to potentially extract sensitive information from other web origins by leveraging crafted HTML pages that interact with audio processing features. The core technical issue lies in the improper handling of audio context states or buffer contents during playback and analysis operations, which inadvertently exposes memory regions containing data associated with different security contexts. In modern web browsers, the Same-Origin Policy is a critical security model designed to prevent malicious sites from accessing resources belonging to other origins; however, this vulnerability circumvents those restrictions by exploiting side-channel effects or direct memory access within the audio subsystem that fails to properly sanitize output based on origin boundaries.
From an operational perspective, this flaw enables attackers to conduct sophisticated cross-origin data theft attacks without requiring user interaction beyond visiting a malicious webpage. By embedding specific JavaScript code that utilizes WebAudio APIs such as AudioContext.createAnalyser() or related methods for frequency domain analysis, an attacker can measure timing differences or amplitude variations in audio buffers that correlate with the content of hidden iframes or other cross-origin resources loaded by the victim's browser. This technique effectively transforms the audio processing pipeline into a covert channel for data exfiltration, allowing the extraction of sensitive information such as authentication tokens, personal identifiers, or proprietary business logic embedded within web applications accessed during the same browsing session. The severity is classified as medium because while it does not allow direct code execution, its ability to bypass fundamental browser security models poses a substantial risk to user privacy and data integrity across various high-value targets including banking portals, email services, and enterprise dashboards.
This vulnerability aligns closely with Common Weakness Enumeration category CWE-200, which covers Information Exposure, specifically detailing scenarios where sensitive information is disclosed due to improper control of access controls or insufficient sanitization of output data. Furthermore, the exploitation method corresponds to MITRE ATT&CK technique T1537, known as Transfer Data via Symmetric Encrypted Canonical Protocol, although in this context it manifests more broadly under cross-origin data theft mechanisms often categorized within broader surveillance and exfiltration tactics found in advanced persistent threat campaigns. The attack vector is classified as remote with low complexity, requiring only that a victim visits a malicious page or has one loaded automatically through drive-by download techniques, making it particularly dangerous for users who frequently navigate untrusted websites while logged into sensitive accounts on other tabs.
Mitigation strategies primarily involve updating the browser to version 155.0.8059.39 or later where these isolation boundaries have been reinforced and memory access patterns within the WebAudio subsystem are strictly validated against origin policies. For organizations unable to immediately patch all endpoints, implementing strict Content Security Policy directives can help mitigate some risks by restricting script execution contexts and preventing unauthorized cross-origin requests that might trigger the vulnerable code paths. Additionally, disabling JavaScript in untrusted sites or using browser extensions that enforce stricter privacy settings can reduce the attack surface available to such exploits until a full remediation cycle is completed across all client systems within the network infrastructure.