CVE-2026-18015: Google Chrome Tint Sandbox Escape Flaw

CVE-2026-18015 Overview

CVE-2026-18015 is a sandbox escape vulnerability in the Tint component of Google Chrome on macOS. The flaw stems from an inappropriate implementation that a remote attacker can trigger through a crafted HTML page. Successful exploitation may allow code executing within the renderer sandbox to break out of its confinement boundary. Google rated the Chromium security severity as Low. The issue affects Chrome for Mac versions prior to 151.0.7922.72.

Critical Impact
A remote attacker can potentially escape the Chrome sandbox on macOS by luring a user to a crafted HTML page, breaking a core browser security boundary.

Affected Products

Google Chrome for macOS prior to 151.0.7922.72
Chromium-based browsers on macOS incorporating the vulnerable Tint component
Downstream distributions embedding affected Chrome/Chromium builds on macOS

Discovery Timeline

2026-07-30 - CVE-2026-18015 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-18015

Vulnerability Analysis

The vulnerability resides in Tint, a component used within Chrome's graphics stack on macOS. An inappropriate implementation allows a remote attacker to influence execution paths that should remain confined to the renderer sandbox. By serving a specifically crafted HTML page, the attacker can induce behavior that leads to a sandbox escape condition on macOS.

A Chrome sandbox escape breaks the isolation barrier between renderer processes and the underlying operating system. When combined with a separate renderer compromise, an escape gives an attacker access to resources normally protected by the sandbox policy.

The issue is fixed in Chrome 151.0.7922.72 for Mac. Google's Chromium security team classified the severity as Low, indicating either constrained exploit prerequisites or limited real-world impact based on internal analysis.

Root Cause

The root cause is an inappropriate implementation within the Tint component on macOS. Public advisories do not disclose the underlying code-level defect. Details are tracked in the Chromium Issue Tracker Entry.

Attack Vector

Exploitation requires a user to visit or be redirected to a crafted HTML page under attacker control. No authentication is required, and the attack is remote over the network. The technical details of the exploitation primitive have not been publicly released. Refer to the Google Chrome Stable Update advisory for vendor guidance.

Detection Methods for CVE-2026-18015

Indicators of Compromise

Chrome for Mac processes running versions earlier than 151.0.7922.72 after the patch release date
Unexpected child processes spawned by Chrome renderer or GPU processes on macOS
Outbound connections from managed macOS endpoints to unknown domains immediately following browsing sessions

Detection Strategies

Inventory installed Chrome versions across macOS fleets and flag any build below 151.0.7922.72
Monitor for anomalous process lineage originating from Google Chrome Helper processes on macOS
Correlate browser telemetry with file system and network activity to identify post-exploitation behavior

Monitoring Recommendations

Ingest macOS endpoint telemetry into a centralized data lake for cross-host correlation and version tracking
Alert on Chrome browser versions that fall behind the current stable channel on managed devices
Review reputation and category of domains loaded in Chrome sessions preceding suspicious process activity

How to Mitigate CVE-2026-18015

Immediate Actions Required

Update Google Chrome on all macOS endpoints to version 151.0.7922.72 or later
Force-restart Chrome after updates to ensure the patched binary is in use
Verify update deployment coverage using endpoint management tooling and remediate stragglers

Patch Information

Google addressed CVE-2026-18015 in the stable channel update for desktop released on the Google Chrome Stable Update blog. The fix is included in Chrome 151.0.7922.72 for Mac. Users receive the update through Chrome's built-in updater once the browser is restarted.

Workarounds

Restrict browsing to trusted sites until the patch is deployed across the environment
Enforce Chrome auto-update policies through MDM to reduce exposure windows on macOS
Consider temporary use of an alternative browser on unpatched macOS devices for high-risk browsing tasks

bash

# Verify installed Chrome version on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version

# Expected output should be 151.0.7922.72 or later