CVE-2026-17744: Google Chrome Linux Sandbox Escape Flaw

CVE-2026-17744 Overview

CVE-2026-17744 is a sandbox escape vulnerability in the File Input component of Google Chrome on Linux. Versions prior to 151.0.7922.72 contain an inappropriate implementation that a remote attacker can exploit through a crafted HTML page. Google's Chromium security team assigned this issue a Medium severity rating.

Successful exploitation allows an attacker to escape the Chrome renderer sandbox on Linux hosts. Sandbox escapes remove a critical browser security boundary and expand what an attacker can reach on the underlying operating system.

Critical Impact
A remote attacker can potentially escape the Chrome sandbox on Linux by luring a user to a crafted HTML page, weakening the browser's primary isolation boundary.

Affected Products

Google Chrome for Linux prior to 151.0.7922.72
Chromium-based browsers on Linux that share the affected File Input implementation
Linux desktop environments deploying vulnerable Chrome Stable builds

Discovery Timeline

2026-07-30 - CVE-2026-17744 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-17744

Vulnerability Analysis

The vulnerability resides in Chrome's File Input handling on Linux. The File Input component processes <input type="file"> interactions, including file selection dialogs and file metadata passed to the renderer. An inappropriate implementation in this path lets attacker-controlled HTML content influence behavior that should stay confined to the renderer sandbox.

By chaining the flaw with a crafted HTML page, a remote attacker can potentially perform a sandbox escape. Escaping the renderer sandbox permits code or actions in a higher-privileged Chrome process, breaking the isolation model that limits what compromised web content can do on the host.

Google addressed the issue in the Stable channel update for desktop that shipped Chrome 151.0.7922.72. Details on the underlying implementation remain restricted while users update, which is standard Chromium practice for sandbox-related issues.

Root Cause

The root cause is an inappropriate implementation in the File Input feature on Linux. The implementation does not enforce the expected constraints on file input handling, allowing web-origin content to influence process boundaries that should be inaccessible from a sandboxed renderer. Refer to the Chromium Issue Tracker Entry once access restrictions are lifted for further detail.

Attack Vector

The attack vector is a crafted HTML page delivered to a targeted user on Linux. A user visiting the malicious page or a compromised site with an embedded payload triggers the vulnerable File Input path. No authentication is required, and standard drive-by-download conditions apply, since the attacker only needs the victim to load attacker-controlled web content in an unpatched Chrome build.

No verified proof-of-concept code is publicly available. See the Google Chrome Desktop Update advisory for the vendor's release notes.

Detection Methods for CVE-2026-17744

Indicators of Compromise

Chrome renderer processes on Linux spawning unexpected child processes outside the standard sandbox helper chain
Unusual file access by Chrome processes to paths outside the browser's normal profile and cache directories
Chrome versions on Linux endpoints reporting a build older than 151.0.7922.72

Detection Strategies

Inventory installed Chrome versions across Linux fleets and flag any build below 151.0.7922.72
Monitor process lineage where chrome or chrome_sandbox parents deviate from expected renderer or utility process patterns
Correlate browser telemetry with web proxy logs to identify users who visited untrusted sites immediately before anomalous Chrome behavior

Monitoring Recommendations

Alert on Chrome renderer processes executing shell commands, writing to autostart locations, or reading sensitive files such as ~/.ssh/ and /etc/passwd
Track outbound connections initiated by Chrome helper processes to domains not associated with the active browsing session
Enable endpoint detection and response coverage on Linux workstations to capture syscall-level activity from browser processes

How to Mitigate CVE-2026-17744

Immediate Actions Required

Update Google Chrome on Linux to version 151.0.7922.72 or later across all endpoints
Restart Chrome after patching to ensure the new binary and sandbox components are loaded
Audit third-party Chromium-based browsers on Linux and apply their corresponding upstream security updates

Patch Information

Google released the fix in the Stable channel desktop update announced on the Chrome Releases blog. Upgrade to Chrome 151.0.7922.72 or newer for Linux. Reference the Google Chrome Desktop Update for the full advisory and build metadata.

Workarounds

Restrict browsing on unpatched Linux endpoints to trusted internal sites until the update is deployed
Enforce enterprise browser policies that disable or limit file upload interactions on sensitive systems
Deploy web filtering to block known malicious domains and reduce exposure to crafted HTML payloads

bash

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

# Debian/Ubuntu: update Chrome to the patched build
sudo apt update && sudo apt install --only-upgrade google-chrome-stable

# RHEL/Fedora: update Chrome via dnf
sudo dnf update google-chrome-stable

# Confirm the resulting version is 151.0.7922.72 or newer
google-chrome --version