CVE-2026-12465: Google Chrome RCE Vulnerability

CVE-2026-12465 Overview

CVE-2026-12465 is an object lifecycle vulnerability in the Metrics component of Google Chrome prior to version 149.0.7827.155. The flaw allows a remote attacker who has already compromised the renderer process to potentially escape the Chrome sandbox using a crafted HTML page. Chromium engineers rated the underlying defect as High severity. The issue is tracked under [CWE-20] (Improper Input Validation) and affects Chrome across Windows, macOS, and Linux desktop builds. A successful sandbox escape moves attacker code from the constrained renderer into the broader browser process, expanding access to the host operating system.

Critical Impact
Successful exploitation chains a compromised renderer into a full sandbox escape, breaking Chrome's primary isolation boundary on Windows, macOS, and Linux.

Affected Products

Google Chrome prior to 149.0.7827.155 (Windows, macOS, Linux desktop builds)
Microsoft Windows hosts running vulnerable Chrome versions
Apple macOS and Linux hosts running vulnerable Chrome versions

Discovery Timeline

2026-06-17 - CVE-2026-12465 published to NVD
2026-06-18 - Last updated in NVD database

Technical Details for CVE-2026-12465

Vulnerability Analysis

The vulnerability resides in Chrome's Metrics subsystem, which collects telemetry and usage data from the browser. Chrome's multi-process architecture isolates untrusted web content inside a sandboxed renderer process. The renderer communicates with the privileged browser process through Mojo IPC interfaces, including those that handle metrics reporting.

An object lifecycle defect in this code path lets a renderer manipulate the state or reference count of a Metrics-related object beyond its intended scope. An attacker who has first achieved code execution in the renderer through a separate flaw can then exercise the lifecycle bug to corrupt browser-process memory or invoke operations on freed objects. The result is a sandbox escape: attacker-controlled code executes outside the renderer's restrictions.

User interaction is required, since the victim must load a crafted HTML page. The attack complexity is high because the adversary must already control the renderer before triggering the lifecycle issue.

Root Cause

The root cause is improper management of object lifetime in the Metrics component, classified as [CWE-20]. Object lifecycle errors in browser IPC layers typically take the form of use-after-free, double-free, or dangling reference conditions. The Metrics code accepts input from a renderer without enforcing the invariants required to keep dependent objects valid for the duration of an operation.

Attack Vector

Exploitation requires two stages. First, the attacker compromises the renderer process, typically through a separate Chrome vulnerability delivered by a malicious site. Second, the attacker serves a crafted HTML page that drives the Metrics interface into the unsafe lifecycle state, escaping the sandbox.

No public proof-of-concept, exploit code, or CISA KEV listing exists for CVE-2026-12465 at the time of publication. The EPSS probability is 0.236% with a percentile of 14.322, reflecting the chained exploitation requirements. Technical specifics are tracked in the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-12465

Indicators of Compromise

Chrome browser process spawning unexpected child processes such as cmd.exe, powershell.exe, bash, or osascript shortly after rendering untrusted content.
Chrome process writing executable files to user-writable paths or loading unsigned modules outside the standard installation directory.
Crash reports or chrome_crashpad_handler events referencing the Metrics component, especially repeated crashes from the same site.
Outbound connections from chrome.exe to low-reputation domains immediately following a page navigation event.

Detection Strategies

Inventory installed Chrome versions across managed endpoints and flag any build earlier than 149.0.7827.155.
Hunt for parent-child process relationships where Chrome launches scripting or shell interpreters, which is anomalous for a sandboxed renderer chain.
Correlate Chrome crash telemetry with subsequent process creation or persistence events on the same host within a short time window.

Monitoring Recommendations

Forward browser process telemetry, including command lines and module loads, to a centralized analytics platform for retroactive hunting.
Monitor enterprise update channels to confirm Chrome 149.0.7827.155 or later is deployed on all endpoints.
Alert on Chrome processes accessing sensitive credential stores, SSH keys, or browser profile files outside normal user activity.

How to Mitigate CVE-2026-12465

Immediate Actions Required

Update Google Chrome to version 149.0.7827.155 or later on all Windows, macOS, and Linux endpoints.
Restart Chrome after the update so the patched binaries replace the running browser processes.
Verify enterprise managed update policies are enforcing the new minimum version rather than deferring updates.
Audit any Chromium-based applications or embedded browser components that may share the vulnerable Metrics code.

Patch Information

Google shipped the fix in the Chrome Stable channel update detailed in the Google Chrome Stable Update advisory. Administrators should confirm clients report version 149.0.7827.155 or higher under chrome://settings/help.

Workarounds

No vendor-supplied workaround replaces the patch; updating Chrome is the supported remediation.
Restrict browsing to trusted sites and enable Enhanced Safe Browsing where feasible to reduce exposure to crafted HTML payloads.
Apply site isolation and disable unnecessary Chrome extensions that could broaden the renderer attack surface.

bash

# Verify installed Chrome version on Linux/macOS
google-chrome --version
# Expected output: Google Chrome 149.0.7827.155 or later

# Windows PowerShell version check
(Get-Item "C:\Program Files\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion