CVE-2026-17864 is a vulnerability in the Updater component of Google Chrome for Mac versions before 151.0.7922.72. It allows a local attacker to perform OS-level privilege escalation by exploiting improper implementation in the updater via a malicious file. The CVSS v3.1 base score is 7.8, indicating high severity, with attack vector local, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. There is no explicit vendor advisory content detailing patch status, but the affected versions are prior to 151.0.7922.72, implying that updating to 151.0.7922.72 or later addresses the issue.

Successful exploitation of this vulnerability allows a local attacker to escalate privileges on the Mac OS, potentially gaining higher-level access than intended. This can lead to full system compromise, including unauthorized access to sensitive data and system resources. The CVSS score of 7.8 reflects a high impact on confidentiality, integrity, and availability.

Users and administrators should update Google Chrome on Mac to version 151.0.7922.72 or later to remediate this vulnerability. The vendor advisory URL indicates a stable channel update addressing this issue. No additional mitigation steps are specified by the vendor.