CVE-2026-106294 in Chrome
Summary
by MITRE • 10/06/2026
Incomplete cleanup in Chromoting in Google Chrome on on Mac prior to 155.0.8059.39 allowed a remote attacker to bypass system access restrictions via crafted network traffic. (Chromium security severity: Low)
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified as an incomplete cleanup issue within the Chromoting component of Google Chrome on macOS prior to version 155.0.8059.39 represents a significant flaw in resource management and state handling during remote desktop sessions. This defect allows for the bypassing of system access restrictions, which fundamentally undermines the security boundaries intended by the operating system and the application itself. The Chromoting module is responsible for facilitating screen sharing and remote control functionalities, processes that inherently require elevated privileges to interact with user interfaces, input devices, and file systems. When these sessions are terminated or interrupted improperly, residual state information or open handles may persist in memory without being correctly released or invalidated by the software logic.
From a technical perspective, this flaw aligns closely with CWE-404, which describes improper resource shutdown or release vulnerabilities. In typical scenarios involving Chromoting, the application establishes deep integration points with macOS APIs to capture display data and inject input events. If the cleanup routine fails to properly revoke these permissions or close associated file descriptors after a session ends, an attacker who has previously established a connection—or potentially one that exploits race conditions during disconnection—may retain access to resources that should have been restricted. This persistence of privileged state effectively creates a window where system access controls are rendered ineffective, allowing operations that would normally be blocked by macOS sandboxing or user permission models.
The operational impact of this vulnerability is particularly concerning given the nature of remote desktop tools. An attacker leveraging crafted network traffic could potentially maintain unauthorized control over the victim's machine even after what appears to be a disconnection from the perspective of the user interface. This persistence can lead to data exfiltration, installation of persistent malware, or further lateral movement within a corporate environment if the compromised Mac is part of a larger network infrastructure. The severity rating of Low in Chromium reflects that while the technical mechanism exists, successful exploitation may require specific conditions such as prior access or precise timing, but the potential for privilege escalation and unauthorized control remains high due to the sensitive nature of remote administration capabilities.
In terms of threat modeling, this vulnerability maps to MITRE ATT&CK techniques related to persistence and defense evasion, specifically those involving improper cleanup that allows attackers to maintain footholds without triggering standard detection mechanisms. It also relates to access control bypasses where application-level permissions are not correctly synchronized with operating system level restrictions after state changes. The use of crafted network traffic suggests that the exploit vector is remote, requiring only a connection to be established before the vulnerability can be triggered during session teardown or interruption phases.
To mitigate this risk, organizations must ensure that all instances of Google Chrome on macOS systems are updated to version 155.0.8059.39 or later immediately upon availability. This patch addresses the incomplete cleanup logic within Chromoting, ensuring that resources and permissions are correctly revoked when sessions end. Additionally, administrators should enforce strict policies regarding remote desktop usage, limiting who can initiate such connections and monitoring for unusual activity during session transitions. Regular auditing of application behavior using endpoint detection and response tools can help identify any anomalous resource retention or permission anomalies indicative of exploitation attempts against this specific flaw.