CVE-2026-12031: Inappropriate implementation in Views in Google Chrome on Windows prior to 149

Synopsis

This is a sandbox escape vulnerability in the Views component of Google Chrome on Windows, affecting versions prior to 149.0.7827.115. An attacker who has already compromised the Chrome renderer process can reach this flaw remotely, without any credentials, by convincing a user to visit a crafted HTML page. Successful exploitation breaks out of the browser sandbox, giving the attacker code execution capabilities on the underlying host beyond what the renderer normally permits. A patched-image rebuild at version 149.0.7827.115 is available on HarborGuard for affected environments.

HarborGuard Coverage

Exploit Conditions

• Network reachabilityRequired

  The attacker delivers the crafted HTML page over the network, requiring the victim's browser to reach attacker-controlled content.

• AuthenticationNot required

  No credentials or account access are needed; the attack is reachable by any unauthenticated remote party.

• Victim interactionRequired

  The victim must navigate to or open a crafted HTML page, requiring social engineering or a malicious link to trigger the exploit.

• Attack complexityDetail

  Attack complexity is high, meaning the attacker must have already compromised the renderer process before this sandbox escape becomes reachable, introducing a significant prerequisite.

Blast Radius

• Attacker breaks out of the Chrome renderer sandbox and gains code execution on the underlying Windows host.
• Confidential data accessible to the host process, including stored credentials, files, and session material, becomes readable.
• The attacker can write or modify files and system state on the host, including persisted application data.
• The host process and dependent services can be crashed or disrupted, causing denial of service beyond the browser tab.