This vulnerability arises from insufficient validation of untrusted input within the WebAuthn implementation in Google Chrome versions before 151.0.7922.72. An attacker with control over the renderer process could exploit this flaw by delivering a crafted PDF file to perform a sandbox escape, potentially leading to full system compromise. The CVSS 3.1 base score is 9.6, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and high impact on confidentiality, integrity, and availability. The issue is documented in a Google Chrome stable channel update advisory dated July 30, 2026.

Successful exploitation could allow an attacker who has already compromised the renderer process to escape the Chrome sandbox, potentially leading to arbitrary code execution with elevated privileges outside the browser sandbox. This compromises system security by breaking the isolation normally enforced by the sandbox.

Google has published a stable channel update for Chrome that addresses this vulnerability. Users and administrators should update Google Chrome to version 151.0.7922.72 or later to remediate this issue. Patch status is not explicitly stated in the advisory, but the presence of the update strongly indicates an official fix is available. No additional mitigation steps are specified by the vendor.