CVE-2026-13804: Google Chrome Use After Free Vulnerability

CVE-2026-13804 Overview

CVE-2026-13804 is a use-after-free vulnerability [CWE-416] in the Chromecast component of Google Chrome. The flaw affects Chrome versions prior to 150.0.7871.47. A remote attacker who has already compromised the renderer process can leverage this bug to escape the Chrome sandbox using a crafted HTML page. Google classifies the Chromium security severity as High.

Successful exploitation gives the attacker code execution outside the renderer sandbox, breaking a core Chrome security boundary. The vulnerability requires user interaction and depends on a prior renderer compromise, which increases attack complexity but does not eliminate risk.

Critical Impact
Sandbox escape from a compromised renderer, enabling code execution in a higher-privileged browser process on unpatched Chrome installations.

Affected Products

Google Chrome (Desktop) versions prior to 150.0.7871.47
Chromecast component within the Chromium browser stack
Any Chromium-based downstream browsers that ship the vulnerable Chromecast code

Discovery Timeline

2026-06-30 - CVE-2026-13804 published to the National Vulnerability Database
2026-06-30 - Google publishes Stable Channel Update for Desktop addressing the flaw
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13804

Vulnerability Analysis

The vulnerability is a use-after-free condition in the Chromecast subsystem of Chrome. Use-after-free bugs occur when code continues to reference memory after it has been freed. An attacker who controls the freed allocation can place attacker-chosen data at that address, then trigger the dangling reference to hijack control flow or corrupt browser state.

In this case, the bug lives in a browser-process component reachable from the renderer through Chromecast-related interfaces. A renderer that has already been compromised, typically through a separate rendering or JavaScript engine bug, can send crafted messages that trigger the use-after-free in the higher-privilege process. This effectively bridges the renderer sandbox to broader browser process privileges.

The attack chain requires user interaction, such as visiting an attacker-controlled page. It also depends on stage one renderer compromise, which is why the attack complexity is rated High. The scope change reflects the sandbox escape, where impact extends beyond the initially exploited component.

Root Cause

The root cause is improper object lifetime management in Chromecast handling code. A pointer to a Chromecast-related object is retained and reused after the object has been destroyed. The classification is [CWE-416] Use After Free. Additional technical details are tracked in the Chromium Issue Tracker Entry.

Attack Vector

Exploitation proceeds in two stages. First, an attacker compromises the Chrome renderer process using a separate vulnerability or logic flaw. Second, the compromised renderer issues a crafted sequence of Chromecast interactions to trigger the dangling pointer in the browser process. The user must load or interact with a malicious HTML page to initiate the chain.

// No verified public proof-of-concept is available for CVE-2026-13804.
// See the Chromium Issue Tracker entry (501873032) for restricted technical details
// once Google releases the embargo.

Detection Methods for CVE-2026-13804

Indicators of Compromise

Chrome browser processes spawning unexpected child processes such as command shells or scripting hosts following normal web browsing activity
Anomalous outbound connections initiated by chrome.exe or its helper processes to previously unseen infrastructure
Crash dumps or Chrome error reports referencing Chromecast components on hosts running versions prior to 150.0.7871.47

Detection Strategies

Inventory installed Chrome versions across managed endpoints and flag any build below 150.0.7871.47
Alert on browser process trees that deviate from baseline, particularly renderer children escalating into non-browser binaries
Correlate web traffic to newly registered or low-reputation domains with subsequent Chrome process anomalies

Monitoring Recommendations

Ingest endpoint telemetry into a centralized platform such as Singularity Data Lake to correlate browser process behavior with network activity at scale
Enable behavioral protection on endpoints so post-exploitation actions from a compromised browser process trigger response, consistent with the behavioral AI models in Singularity Endpoint
Review Chrome crash telemetry and enterprise reporting for repeated faults in Chromecast-related modules

How to Mitigate CVE-2026-13804

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all managed endpoints
Force a browser restart after deployment so the patched binaries are loaded into memory
Audit Chromium-based third-party browsers and update them once vendors ship builds incorporating the upstream fix

Patch Information

Google addressed CVE-2026-13804 in the Chrome Stable Channel update published on 2026-06-30. Administrators should deploy Chrome 150.0.7871.47 or later. Refer to the Chrome Security Update Release for the full advisory and rollout details.

Workarounds

Disable Chromecast or media casting functionality via enterprise policy where the feature is not required
Restrict browsing to trusted destinations using enterprise proxy or DNS filtering until patching completes
Enforce site isolation and disable unnecessary extensions to reduce the initial renderer compromise surface

bash

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

# Windows: query installed version from the registry
reg query "HKLM\Software\Google\Update\Clients\{8A69D345-D564-463C-AFF1-A69D9E530F96}" /v pv

# macOS: check bundled version string
defaults read /Applications/Google\ Chrome.app/Contents/Info CFBundleShortVersionString