CVE-2026-79218: Google Chrome Sandbox RCE Vulnerability

CVE-2026-79218 Overview

CVE-2026-79218 is an incorrect authorization vulnerability in the Google Chrome Sandbox component. The flaw affects Chrome versions prior to 152.0.7977.65. A remote attacker who has already compromised the renderer process can escape the sandbox by delivering a crafted HTML page. Successful exploitation may lead to arbitrary code execution outside the sandboxed context on the host system. Google's Chromium project rated the security severity as High. The vulnerability is tracked under CWE-863: Incorrect Authorization.

Critical Impact
A renderer compromise chained with this flaw enables sandbox escape and arbitrary code execution on the victim host, breaking Chrome's primary isolation boundary.

Affected Products

Google Chrome versions prior to 152.0.7977.65 on desktop platforms
Chromium-based browsers that share the affected Sandbox authorization logic
Enterprise Chrome deployments not yet updated through the Stable channel

Discovery Timeline

2026-08-25 - CVE-2026-79218 published to the National Vulnerability Database
2026-08-27 - Last updated in NVD database

Technical Details for CVE-2026-79218

Vulnerability Analysis

The vulnerability resides in Chrome's Sandbox authorization logic. The Sandbox is designed to isolate renderer processes and enforce that untrusted web content cannot access privileged operations. Incorrect authorization checks allow a compromised renderer to invoke operations that should be restricted to trusted processes.

Exploitation requires an attacker to first compromise the renderer process, typically by chaining a separate renderer-side memory corruption or logic bug. Once inside the renderer, the attacker leverages the incorrect authorization to reach code paths outside the sandbox boundary. This can result in arbitrary code execution with the privileges of the broker or another higher-trust Chrome process.

The attack requires user interaction, such as visiting a crafted HTML page. The scope is changed, meaning the impact extends beyond the vulnerable component. Confidentiality, integrity, and availability impacts are all high.

Root Cause

The root cause is an incorrect authorization check within the Sandbox component, classified under CWE-863. The affected code fails to properly validate whether a caller from the renderer holds the authority to perform certain privileged actions. Details of the specific check are tracked in the Chromium Issue Tracker Entry.

Attack Vector

The attack is network-based and delivered through a crafted HTML page. The exploitation chain requires two stages: first, a renderer compromise via a separate vulnerability, and second, use of the incorrect authorization to break out of the sandbox. Because the victim must load attacker-controlled content, exploitation typically involves phishing, malicious advertising, or compromised third-party resources.

No verified public proof-of-concept code is available. The vulnerability mechanism is described in prose based on the vendor advisory and Chromium issue tracker; see the Google Chrome Stable Update for the official notice.

Detection Methods for CVE-2026-79218

Indicators of Compromise

Chrome child processes spawning unexpected system binaries such as cmd.exe, powershell.exe, or shell interpreters
Renderer processes writing to filesystem locations outside their normal profile directories
Anomalous outbound network connections initiated by Chrome broker or utility processes
Chrome versions below 152.0.7977.65 observed in endpoint inventory telemetry

Detection Strategies

Inventory installed Chrome versions and flag hosts running builds earlier than 152.0.7977.65
Monitor process lineage for Chrome renderer or broker processes spawning non-browser children
Alert on Chrome processes performing memory operations or API calls consistent with sandbox escape patterns
Correlate visits to newly registered or low-reputation domains with subsequent Chrome child-process anomalies

Monitoring Recommendations

Collect endpoint process telemetry, including parent-child relationships for all Chrome processes
Ingest browser version data from asset management or EDR agents into a central data lake for compliance tracking
Track Chrome crash reports and renderer termination events that may indicate exploitation attempts
Review web proxy logs for HTML content served from suspicious hosts to users on unpatched Chrome builds

How to Mitigate CVE-2026-79218

Immediate Actions Required

Update Google Chrome to version 152.0.7977.65 or later on all managed endpoints
Force restart Chrome instances to ensure the patched binary is loaded into memory
Verify Chromium-based browsers in the environment for equivalent fixed builds
Prioritize patching for users who routinely browse untrusted or high-risk web content

Patch Information

Google released the fix in the Stable channel update to Chrome version 152.0.7977.65. Refer to the Google Chrome Stable Update advisory for the full changelog. Enterprise administrators should distribute the update through managed deployment channels such as Chrome Browser Cloud Management, WSUS-integrated tooling, or platform package managers.

Workarounds

Restrict browsing to trusted sites through enterprise web filtering until patches are deployed
Enforce Chrome enterprise policies that block risky content types and disable unnecessary features
Deploy site isolation and strict HTTPS-only mode to reduce the attack surface for renderer compromise
Educate users to avoid clicking links from unsolicited email or messages during the remediation window

bash

# Verify installed Chrome version on Linux
google-chrome --version

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

# Verify installed Chrome version on Windows (PowerShell)
(Get-Item "$env:ProgramFiles\Google\Chrome\Application\chrome.exe").VersionInfo.ProductVersion