CVE-2026-13901: Google Chrome RCE Vulnerability

CVE-2026-13901 Overview

CVE-2026-13901 is an insufficient policy enforcement flaw in the Serial component of Google Chrome versions prior to 150.0.7871.47. The vulnerability allows a remote attacker who has already compromised the renderer process to potentially escape the Chrome sandbox using a crafted HTML page. Google classifies the underlying Chromium severity as Medium, but the NVD assigns a CVSS 3.1 base score of 9.6 due to scope change and full impact on confidentiality, integrity, and availability. Exploitation requires user interaction with an attacker-controlled page, and the flaw is tracked under [CWE-20] Improper Input Validation.

Critical Impact
A successful sandbox escape lets attackers execute code outside the renderer, breaking Chrome's primary isolation boundary and enabling access to the host operating system.

Affected Products

Google Chrome desktop prior to 150.0.7871.47
Chromium-based browsers embedding the vulnerable Serial implementation
Downstream distributions synchronized with the Chrome Stable channel

Discovery Timeline

2026-06-30 - CVE-2026-13901 published to NVD alongside the Chrome Stable channel update
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13901

Vulnerability Analysis

The flaw resides in Chrome's implementation of the Web Serial API, which brokers access between web content and serial devices attached to the host. Insufficient policy enforcement means the browser process does not adequately validate or restrict requests originating from the renderer. An attacker who first compromises the renderer, typically through a separate memory-corruption bug, can abuse the Serial IPC surface to influence higher-privileged browser components. The Serial subsystem crosses a trust boundary because the browser process holds direct access to hardware interfaces that the sandbox is designed to block.

Root Cause

The underlying weakness is [CWE-20] Improper Input Validation. Chrome's Serial code path accepts requests from the renderer without enforcing the full set of security policies expected at the process boundary. This gap creates an opportunity to trigger behavior outside the sandbox's threat model.

Attack Vector

Exploitation is a two-stage chain. The attacker first needs code execution inside the renderer process, then leverages the crafted HTML page to invoke the vulnerable Serial pathway. The user must interact with the malicious content, for example by visiting an attacker-controlled site. Because the sandbox escape crosses a scope boundary, a successful chain grants the attacker the privileges of the browser process on the victim host.

No public proof-of-concept, exploit code, or CISA KEV listing exists for this CVE at the time of writing. See the Chromium Issue Tracker Entry and the Google Chrome Stable Update advisory for vendor details.

Detection Methods for CVE-2026-13901

Indicators of Compromise

Chrome browser processes spawning unexpected child processes such as command shells, powershell.exe, or scripting hosts
Renderer processes making anomalous IPC calls to the Serial service prior to browser-process code execution
Persistence artifacts written to disk immediately following browsing sessions to untrusted sites

Detection Strategies

Inventory installed Chrome versions across the fleet and flag any build below 150.0.7871.47
Alert on process lineage where chrome.exe (browser or renderer) launches non-standard child binaries
Correlate outbound web traffic to newly registered or low-reputation domains with subsequent local process anomalies

Monitoring Recommendations

Enable EDR telemetry for browser child-process creation, script interpreters, and unsigned binary execution
Ingest browser and endpoint logs into a central data lake to hunt for renderer-to-browser escape patterns
Track Web Serial API usage in managed browser policies where enterprise device access is not expected

How to Mitigate CVE-2026-13901

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all managed endpoints
Restart browser sessions after deploying the patch so the vulnerable code is unloaded from memory
Audit any Chromium-based applications embedding the affected Serial component and apply upstream fixes

Patch Information

Google addressed CVE-2026-13901 in the Chrome Stable channel release documented in the Google Chrome Stable Update. Enterprises should distribute the patched build through their standard software management tooling and verify installation using version telemetry.

Workarounds

Disable the Web Serial API through enterprise policy by setting DefaultSerialGuardSetting to block access where hardware serial usage is not required
Restrict Chrome access to trusted sites using site isolation and URL allow-lists until the patch is deployed
Enforce automatic browser updates through group policy or MDM to reduce exposure windows on future Chrome CVEs

bash

# Configuration example: enforce Chrome policy to block Web Serial access
# Windows registry (HKLM)
reg add "HKLM\Software\Policies\Google\Chrome" /v DefaultSerialGuardSetting /t REG_DWORD /d 2 /f

# macOS managed preferences
defaults write com.google.Chrome DefaultSerialGuardSetting -int 2

# Linux managed policy JSON (/etc/opt/chrome/policies/managed/serial.json)
# {
#   "DefaultSerialGuardSetting": 2
# }