CVE-2026-106299 in Chrome
Summary
by MITRE • 10/06/2026
Improper input validation in WebAudio in Google Chrome prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an improper input validation flaw within the WebAudio API of Google Chrome prior to version 155.0.8059.39 represents a significant, albeit context-dependent, security risk that primarily affects users with compromised renderer processes. This issue stems from insufficient sanitization or boundary checking when processing audio-related inputs, which allows an attacker who has already achieved code execution within the browser's rendering engine to manipulate internal state in ways not intended by the application logic. The severity is classified as low because the attack vector requires a prior compromise of the renderer process, meaning that this vulnerability cannot be exploited through standard remote attacks such as visiting a malicious webpage alone; it serves instead as an escalation path for attackers who have already breached the sandbox boundary or are leveraging other vulnerabilities to gain initial foothold within the browser's isolated environment.
From a technical perspective, the WebAudio API provides powerful capabilities for processing and synthesizing audio in web applications, but these features require strict adherence to security boundaries to prevent side-channel attacks or unauthorized access to system resources. The flaw likely involves a failure to properly validate parameters passed to specific AudioContext methods or nodes, allowing crafted HTML pages containing malicious JavaScript to trigger undefined behavior or bypass internal checks that restrict access to sensitive system audio devices or hardware acceleration features. This type of input validation error is commonly associated with CWE-20 Improper Input Validation and often facilitates privilege escalation within the browser's multi-process architecture by exploiting assumptions about the integrity of data originating from script execution contexts.
The operational impact of this vulnerability is limited in scope due to its dependency on renderer process compromise, but it remains critical for threat actors aiming to establish persistence or escalate privileges to higher-level system access. By bypassing system access restrictions related to audio hardware, an attacker could potentially exfiltrate sensitive data through covert channels, monitor user activity via microphone abuse without explicit permission prompts in certain configurations, or interfere with legitimate audio applications running on the host operating system. This aligns with ATT&CK techniques such as T1059 Command and Scripting Interpreter for initial execution within the renderer and potentially T1074 Data Staged if used to prepare data for exfiltration through audio-based side channels, although the latter is speculative without further technical disclosure of the specific bypass mechanism.
Mitigation strategies primarily involve updating Google Chrome to version 155.0.8059.39 or later, where these input validation checks have been hardened and corrected by the Chromium security team. For organizations managing large deployments of browsers, implementing automated patch management systems ensures that this fix is applied promptly across all endpoints. Additionally, enforcing strict Content Security Policies can help mitigate the risk of arbitrary script execution within renderer processes, thereby reducing the likelihood of an attacker reaching the state required to exploit this specific flaw. Monitoring for unusual audio device access patterns or anomalous network traffic originating from browser processes may also provide early detection indicators for attempts to leverage such vulnerabilities in conjunction with other exploits.