CVE-2026-106185 in Chrome
Summary
by MITRE • 10/06/2026
Improper input validation in Viz 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: Medium)
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Analysis
by VulDB Data Team • 10/06/2026
The vulnerability identified as an improper input validation flaw within Google Chrome's Viz component represents a significant breach in the browser's isolation model, specifically affecting versions prior to 155.0.8059.39. The Viz compositor is responsible for managing the rendering pipeline and handling graphics operations on behalf of web content. In this instance, the security severity was classified as Medium by Chromium developers because the exploitation requires a pre-condition where an attacker has already compromised the renderer process. This distinction is critical in understanding the threat landscape, as it indicates that the vulnerability does not allow for direct remote code execution from untrusted network sources alone but rather serves as a privilege escalation vector within the browser's sandboxed environment.
The technical root cause lies in insufficient validation of input parameters passed to graphics-related functions or data structures managed by the Viz layer. When a crafted HTML page is processed, it can trigger specific rendering paths that fail to properly sanitize or verify the integrity and bounds of certain inputs. This lack of rigorous checking allows an attacker who has achieved code execution within a renderer process to manipulate internal state in ways that were not anticipated by the security model. By exploiting this flaw, the malicious content can bypass system access restrictions that are typically enforced at higher privilege levels, such as those managed by the browser's main process or operating system level sandboxing mechanisms.
From an operational impact perspective, while the initial compromise of a renderer is often mitigated by Chrome’s site isolation and sandboxing features, this vulnerability undermines those protections. An attacker who has already injected malicious code into a webpage can leverage this flaw to escape the confines of that specific tab or process context. This could potentially lead to unauthorized access to sensitive data stored in other processes, interception of network requests from more privileged contexts, or further lateral movement within the browser's architecture. The ability to bypass system access restrictions effectively neutralizes several layers of defense designed to contain damage and limit the blast radius of a typical web-based attack.
This vulnerability aligns with CWE-20 Improper Input Validation, as it stems directly from the failure to adequately check or sanitize user-controlled data before its use in security-critical operations. Furthermore, in terms of offensive cybersecurity frameworks such as MITRE ATT&CK, this behavior is consistent with techniques related to Defense Evasion and Privilege Escalation within software applications. Specifically, it reflects methods used to bypass process injection protections or sandbox escapes by exploiting logic errors in component communication rather than relying on memory corruption exploits alone.
To mitigate the risks associated with this vulnerability, users must ensure that their Google Chrome installation is updated to version 155.0.8059.39 or later immediately upon availability. Since the exploit chain requires a compromised renderer process, maintaining up-to-date browser versions remains the primary defense against such escalation attacks. Additionally, organizations should enforce strict content security policies and utilize sandboxing technologies that limit the capabilities of web pages by default. Regular auditing of third-party extensions is also recommended, as malicious extensions can serve as an initial vector for compromising a renderer process, thereby setting the stage for exploitation of this specific Viz component flaw.