CVE-2026-79109: Google Chrome Printing RCE Vulnerability

CVE-2026-79109 Overview

CVE-2026-79109 is an improper input validation vulnerability [CWE-20] in the Printing component of Google Chrome. The flaw affects Chrome versions prior to 152.0.7977.65. A remote attacker who has already compromised the renderer process can leverage a crafted HTML page to execute arbitrary code outside the Chrome sandbox. Successful exploitation results in a sandbox escape, elevating attacker capabilities from the confined renderer to the host operating system context. Google Chrome's Chromium project rates the security severity as Medium, while the NVD assigns a higher score reflecting the impact of sandbox escape on confidentiality, integrity, and availability.

Critical Impact
Attackers who chain this bug with a renderer compromise can escape the Chrome sandbox and execute arbitrary code on the target host.

Affected Products

Google Chrome versions prior to 152.0.7977.65 (Desktop Stable channel)
Chromium-based browsers incorporating the vulnerable Printing component
All supported desktop platforms shipping the affected Chrome build

Discovery Timeline

2026-08-25 - CVE-2026-79109 published to the National Vulnerability Database
2026-08-27 - Last updated in the NVD database

Technical Details for CVE-2026-79109

Vulnerability Analysis

The vulnerability resides in Chrome's Printing subsystem, which handles print preview and rendering pipelines invoked from web content. Improper input validation permits data originating in a compromised renderer to influence privileged operations executed outside the sandbox boundary. Because Printing crosses the process trust boundary between the renderer and higher-privileged browser components, invalid input can steer execution paths that were designed to run only against trusted values.

The issue is classified under [CWE-20: Improper Input Validation]. Chromium tracks the underlying report as Chromium Issue #498367544. The scope change reflects the sandbox escape: code that starts confined in the renderer ends up running with broader privileges granted to the browser process.

Root Cause

The Printing component fails to fully validate structured input passed from the renderer over Chrome's inter-process communication (IPC) channel. When a compromised renderer submits crafted print-related data, the receiving code processes it without enforcing all expected constraints. This gap allows attacker-controlled values to reach code paths that assume trusted, well-formed input.

Attack Vector

Exploitation requires two stages. First, the attacker must compromise the renderer process, typically through a separate memory-corruption or logic bug triggered by a malicious web page. Second, the attacker uses the now-controlled renderer to send a crafted HTML page or IPC payload that reaches the vulnerable Printing code. The user must interact with the malicious content for the chain to succeed, which is reflected in the high attack complexity and required user interaction. No proof-of-concept code has been published, and there are no verified code examples available. Refer to the Chromium Issue #498367544 tracker for technical detail as it becomes public.

Detection Methods for CVE-2026-79109

Indicators of Compromise

Chrome browser processes spawning unexpected child processes such as command shells, powershell.exe, or scripting hosts immediately after visiting untrusted pages
Print-related Chrome utility processes performing file writes or network connections inconsistent with normal print workflows
Renderer processes crashing repeatedly before browser-process anomalies appear, suggesting an exploitation attempt

Detection Strategies

Alert on process-lineage anomalies where chrome.exe or its printing utility processes launch non-print binaries
Correlate browser crash telemetry with subsequent unusual process activity on the same host
Track outbound connections initiated by Chrome utility processes to domains outside the organization's baseline

Monitoring Recommendations

Ingest endpoint process, file, and network telemetry into a centralized analytics platform and retain it long enough for chained-exploit investigations
Track installed Chrome versions across the fleet and flag any endpoint running a build earlier than 152.0.7977.65
Review print subsystem logs and Windows Event Logs for abnormal print spooler or driver interactions initiated by browser processes

How to Mitigate CVE-2026-79109

Immediate Actions Required

Update Google Chrome to version 152.0.7977.65 or later on every managed endpoint through enterprise update policies
Restart Chrome after the update to ensure the patched binaries are loaded on all user sessions
Audit browser-version compliance and prioritize endpoints exposed to high-risk browsing, including administrator and developer workstations

Patch Information

Google addressed CVE-2026-79109 in the Chrome Stable channel release documented in the Google Chrome Stable Update. Administrators should confirm deployment of Chrome 152.0.7977.65 or later. Chromium-based browser vendors typically follow within days; verify that vendor-specific builds have integrated the upstream fix.

Workarounds

Restrict browsing to trusted sites via web filtering until patched Chrome builds are deployed across the environment
Enforce Chrome Enterprise policies that disable or constrain print preview functionality where operationally feasible
Apply least-privilege controls so that a successful sandbox escape lands in a low-privileged user context rather than an administrative session

bash

# Verify installed Chrome version on Windows endpoints
reg query "HKLM\SOFTWARE\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

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

# Confirm the version is 152.0.7977.65 or later before considering the host remediated