Google urgently releases Chrome security update: fixes zero-day vulnerability already being exploited in the wild, urges users to upgrade immediately

On November 9, 2026, Google released an emergency stable channel update for the desktop Chrome browser, fixing nine security vulnerabilities, including a zero-day vulnerability that was already being exploited in the wild. This update raises the Chrome version on Windows and Mac platforms to 157.8103.5/.51, and to 157.8103.5 on the Linux platform, and will be gradually rolled out over the next few days to weeks. The core focus of this update is the high-risk vulnerability numbered CVE-2026-125350, which is a use-after-free issue in an XML component. Google explicitly stated in the announcement that "CVE-2026-125350 is known to be exploited in the wild," but did not disclose specific attack methods, the scale of victims, or attribution of the attack activities.

The vulnerability was reported by an anonymous researcher on November 6, 2026, just three days before Google released the fix. Among the nine fixes, seven are classified as "high risk" and two as "medium risk." In addition to CVE-2026-125350, another high-risk vulnerability, CVE-2026-125346, also pertains to a use-after-free issue in an XML component, reported by Arni Hardarson of Neonix Security on October 12, 2026, but Google only marked CVE-2026-125350 as an actively exploited vulnerability. The other high-risk vulnerabilities include uninitialized resources in WebGL, improper FileSystem authorization, synthesizer buffer overflow, GPU out-of-bounds write, and V8 type confusion, most of which were discovered by Google's internal security team.

Google also confirmed that the Android version of Chrome (157.8103.5) released on the same day includes the same security fixes as the desktop version, with no exceptions noted. Users on the Extended Stable channel should install the update released separately on November 9, with Windows and Mac versions being 156.8078.96, which also lists CVE-2026-125350 as a high-risk fix. The Hong Kong Government Computer Security Incident Coordination Centre (GovCERT.HK) issued a security alert on the same day, defining affected systems as versions prior to Chrome 157.8103.5, and pointed out that successful exploitation of the related vulnerabilities could lead to remote code execution, denial of service, tampering, or bypassing security restrictions. The Hong Kong Computer Security Incident Coordination Centre (HKCERT) rated the risk level of this update as "extremely high risk." Google explained in the announcement that access to vulnerability details and links may remain restricted until most users complete the update. The company recommends that users manually check and trigger the update via "Settings → About Chrome," and restart the browser after completing the update for the patch to take effect. For users still running versions prior to Chrome 157.8103.5, the current priority action is to confirm the version number and restart immediately to complete the upgrade.