CVE-2026-13899: Google Chrome Use After Free Vulnerability

CVE-2026-13899 Overview

CVE-2026-13899 is a use-after-free vulnerability in the HTML component of Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.47 on desktop platforms. A remote attacker can trigger arbitrary code execution inside the renderer sandbox by luring a user to a crafted HTML page. The weakness is tracked under CWE-416 and was rated Medium by the Chromium security team, while NVD scored it 8.8 due to network exploitability with user interaction. Successful exploitation compromises confidentiality, integrity, and availability of the rendering process.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome sandbox by serving a crafted HTML page to any user running an unpatched browser.

Affected Products

Google Chrome for Desktop prior to 150.0.7871.47
Chromium-based browsers embedding the same HTML component prior to milestone 150
Downstream distributions bundling vulnerable Chromium builds

Discovery Timeline

2026-06-30 - CVE-2026-13899 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13899

Vulnerability Analysis

The vulnerability is a use-after-free (UAF) condition within the HTML subsystem of Blink, Chrome's rendering engine. A use-after-free occurs when code continues to reference heap memory after that memory has been released. In Blink, object lifetimes are governed by garbage collection and reference counting across DOM and layout objects. When a lifetime assumption is violated, an attacker can reallocate the freed region with controlled data and coerce the engine into using a dangling pointer.

Exploitation proceeds inside the renderer process. Successful primitives yield arbitrary code execution constrained by the Chrome sandbox. Attackers typically chain such flaws with a sandbox escape to achieve full system compromise, though this CVE alone does not provide that escape.

Root Cause

The root cause is improper object lifetime management in HTML processing. Script-driven mutations of the DOM or related structures free an object while another code path retains a raw reference. Subsequent dereference of the stale pointer triggers the vulnerable state. Full technical details are tracked in the Chromium Issue Tracker Entry.

Attack Vector

Exploitation requires only that a user open or is redirected to attacker-controlled HTML. Delivery vectors include phishing links, malvertising, watering-hole compromises, and cross-site iframes on trusted domains. No credentials are required, and the attack traverses the network. The user interaction requirement is minimal, satisfied by loading a page. See the Google Chrome Stable Update for vendor confirmation of the affected surface.

Detection Methods for CVE-2026-13899

Indicators of Compromise

Renderer process crashes with heap corruption or access violation signatures on chrome.exe child processes
Outbound connections from Chrome renderer processes to newly registered or low-reputation domains hosting HTML payloads
Unexpected child process creation from chrome.exe following browsing activity

Detection Strategies

Inventory browser versions across the fleet and flag any Chrome build below 150.0.7871.47 as vulnerable
Hunt for HTML pages containing anomalous DOM mutation patterns paired with large heap-spray-style script allocations in web proxy logs
Correlate browser crash telemetry with URL history to identify repeat visits to suspicious domains preceding faults

Monitoring Recommendations

Forward Windows Error Reporting and macOS CrashReporter data for chrome_child processes to the SIEM for triage
Monitor EDR telemetry for anomalous process trees originating from Chrome renderer sandboxes
Alert on execution of scripting hosts or shell binaries spawned as descendants of chrome.exe

How to Mitigate CVE-2026-13899

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints
Restart browser sessions after patch deployment to ensure the vulnerable process image is unloaded
Audit Chromium-based applications and embedded WebViews for use of vulnerable upstream code

Patch Information

Google released the fix in the Stable channel update documented in the Google Chrome Stable Update. Administrators should push the update through enterprise policy or managed software distribution. No public exploit or CISA KEV listing exists for CVE-2026-13899 at the time of publication, and the EPSS probability is 0.366%.

Workarounds

Enforce Chrome's Site Isolation and strict site-per-process policies to reduce cross-origin data exposure from a compromised renderer
Restrict browsing to allow-listed domains for high-risk user groups until patching completes
Deploy web filtering to block newly observed and low-reputation domains that may host exploit pages

bash

# Enterprise policy example: enforce minimum Chrome version and auto-update
# Windows Group Policy registry keys (HKLM\Software\Policies\Google\Chrome)
TargetVersionPrefix = "150.0.7871.47"
UpdateDefault      = 1
AutoUpdateCheckPeriodMinutes = 60