CVE-2026-11279: Google Chrome DevTools RCE Vulnerability

CVE-2026-11279 Overview

CVE-2026-11279 is an out-of-bounds read vulnerability in the DevTools component of Google Chrome versions prior to 149.0.7827.53. A remote attacker can exploit this flaw by serving a crafted HTML page to a target user. Successful exploitation allows arbitrary code execution inside the Chrome sandbox. The vulnerability is tracked under CWE-125 (Out-of-Bounds Read) and affects Chrome installations on Windows, macOS, and Linux. Google rates the underlying Chromium security severity as Low, but the NVD assigns a higher CVSS score reflecting broader impact on confidentiality, integrity, and availability when chained with user interaction.

Critical Impact

Remote attackers can execute arbitrary code inside the Chrome sandbox through a malicious HTML page processed by DevTools, enabling further exploitation chains when combined with a sandbox escape.

Affected Products

• Google Chrome versions prior to 149.0.7827.53
• Chrome on Apple macOS, Microsoft Windows, and Linux
• Chromium-based browsers that incorporate the affected DevTools code

Discovery Timeline

• 2026-06-05 - CVE-2026-11279 published to NVD
• 2026-06-10 - Last updated in NVD database

Technical Details for CVE-2026-11279

Vulnerability Analysis

The vulnerability resides in Chrome DevTools, the integrated debugging and inspection toolset built into the browser. DevTools handles structured data passed from the renderer and inspected page contexts. An out-of-bounds read occurs when DevTools accesses memory beyond the allocated buffer boundaries while parsing attacker-controlled content from a crafted HTML page.

The out-of-bounds read leaks adjacent memory into a context where attacker-controlled JavaScript can observe or manipulate it. This primitive can be combined with control-flow corruption techniques to achieve arbitrary code execution inside the Chrome sandbox. The sandbox confinement limits direct host impact, but the foothold can be chained with a separate sandbox escape to compromise the underlying operating system.

User interaction is required, as the victim must load the malicious page or open DevTools against an attacker-controlled context. The EPSS probability is approximately 0.102%, indicating a low predicted likelihood of near-term exploitation at the time of publication.

Root Cause

The root cause is missing or insufficient bounds checking in a DevTools data-handling routine. When the affected function reads from a buffer using an attacker-influenced index or length, it accesses memory outside the intended object. [CWE-125] classifies this class of weakness, which commonly produces information disclosure and can serve as a building block for code execution when combined with type confusion or pointer corruption.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker hosts a crafted HTML page that, when loaded or inspected in Chrome DevTools, triggers the out-of-bounds read. No authentication is required. Refer to the Chromium Issue Tracker Entry and the Google Chrome Update Announcement for vendor details.

Detection Methods for CVE-2026-11279

Indicators of Compromise

• Chrome processes crashing with read access violations originating in DevTools modules
• Unexpected child processes spawned by chrome.exe shortly after DevTools usage
• Outbound connections from renderer processes to unfamiliar domains following visits to untrusted pages
• Browser telemetry showing DevTools opened automatically on attacker-controlled origins

Detection Strategies

• Inventory Chrome installations and flag any build older than 149.0.7827.53
• Monitor endpoint telemetry for renderer or DevTools crashes correlated with specific URLs
• Inspect proxy and DNS logs for users browsing newly registered or low-reputation domains hosting HTML payloads
• Correlate browser process anomalies with subsequent process creation or file write events

Monitoring Recommendations

• Centralize Chrome version data and crash reports in your SIEM for continuous version compliance checks
• Alert on Chrome renderer or utility processes that spawn shells, scripting hosts, or LOLBins
• Track DevTools usage patterns on managed endpoints through enterprise browser policies

How to Mitigate CVE-2026-11279

Immediate Actions Required

• Update Google Chrome to version 149.0.7827.53 or later on all Windows, macOS, and Linux endpoints
• Force restart of Chrome processes after deployment to ensure the patched binary is active
• Audit Chromium-based browsers and Electron applications for embedded versions of the affected component
• Restrict access to untrusted websites through web filtering until patching is verified

Patch Information

Google addressed the issue in the Chrome Stable channel release 149.0.7827.53. Refer to the Google Chrome Update Announcement for release notes and the Chromium Issue Tracker Entry for technical context. Enterprise administrators should distribute the update through managed update channels or MDM tooling.

Workarounds

• Disable or restrict DevTools usage on managed endpoints using the DeveloperToolsAvailability enterprise policy
• Block access to high-risk and untrusted domains through web proxies until updates are deployed
• Educate users to avoid opening DevTools on untrusted pages

# Enforce Chrome DevTools restriction via enterprise policy (Linux example)
sudo mkdir -p /etc/opt/chrome/policies/managed
cat <<EOF | sudo tee /etc/opt/chrome/policies/managed/devtools_policy.json
{
  "DeveloperToolsAvailability": 2
}
EOF