CVE-2026-12462: Google Chrome Use After Free Vulnerability

CVE-2026-12462 Overview

CVE-2026-12462 is a use-after-free vulnerability [CWE-416] in the Media component of Google Chrome versions prior to 149.0.7827.155. A remote attacker who has already compromised the renderer process can exploit this flaw to execute arbitrary code inside the Chrome sandbox by serving a crafted HTML page. Google rates the Chromium security severity as High. The defect affects Chrome on Windows, macOS, and Linux platforms.

Critical Impact
Successful exploitation allows arbitrary code execution within the sandboxed renderer process, providing attackers a foothold for further sandbox-escape chains against Chrome users on Windows, macOS, and Linux.

Affected Products

Google Chrome prior to 149.0.7827.155 on Microsoft Windows
Google Chrome prior to 149.0.7827.155 on Apple macOS
Google Chrome prior to 149.0.7827.155 on Linux

Discovery Timeline

2026-06-17 - CVE-2026-12462 published to NVD
2026-06-18 - Last updated in NVD database

Technical Details for CVE-2026-12462

Vulnerability Analysis

The vulnerability is a use-after-free condition in Chrome's Media subsystem. Use-after-free defects occur when code dereferences a pointer to memory that has already been released, allowing an attacker to influence the contents of that freed region before access. In Chrome's multi-process architecture, the Media component handles audio and video decoding tasks inside the renderer process. By orchestrating specific media object lifecycles through a crafted HTML page, an attacker can trigger the dangling pointer and gain control over execution flow inside the renderer sandbox.

Exploitation requires that the attacker has already compromised the renderer process, meaning this flaw is typically chained with a prior bug to deepen control or pivot toward a sandbox escape. The flaw carries network attack vector and high attack complexity, and user interaction is required for the initial vector.

Root Cause

The root cause is improper object lifetime management within Chrome's Media handling code. A media-related object is freed while a reference to it remains reachable, and subsequent operations dereference that stale pointer. Refer to the Chromium Issue Tracker Entry for upstream technical detail.

Attack Vector

The attacker delivers a crafted HTML page that the victim renders in a vulnerable Chrome build. Because exploitation presupposes a compromised renderer, an adversary first plants attacker-controlled code into the renderer through a separate primitive, then triggers the Media use-after-free to execute arbitrary code within the sandbox boundary. This positions the attacker to launch follow-on sandbox-escape exploits.

No public proof-of-concept code has been published for CVE-2026-12462. See the Google Chrome Update Announcement for vendor remediation guidance.

Detection Methods for CVE-2026-12462

Indicators of Compromise

Chrome renderer processes crashing or restarting unexpectedly while loading media-heavy pages.
Outbound connections from chrome.exe or Google Chrome Helper processes to uncategorized or newly registered domains following media playback.
Anomalous child processes spawned from a Chrome renderer process, which is uncommon under normal operation.

Detection Strategies

Inventory Chrome installations across the fleet and flag any version below 149.0.7827.155 as exposed.
Monitor endpoint telemetry for Chrome renderer crashes correlated with HTML pages containing <video>, <audio>, or Media Source Extensions usage.
Hunt for renderer-to-broker IPC anomalies and unexpected file or network access originating from sandboxed renderer processes.

Monitoring Recommendations

Aggregate browser process telemetry into a centralized analytics platform and alert on Chrome version drift from the patched baseline.
Correlate crash dump signatures referencing Chrome Media components with subsequent process or network activity on the same host.
Track URL telemetry from proxies and DNS logs for sites repeatedly triggering Chrome renderer instability across multiple users.

How to Mitigate CVE-2026-12462

Immediate Actions Required

Update Google Chrome to version 149.0.7827.155 or later on all Windows, macOS, and Linux endpoints.
Restart Chrome after the update so the patched binary loads; pending updates do not take effect until the browser is relaunched.
Verify enterprise deployment tooling and Chrome auto-update channels are functioning on managed devices.

Patch Information

Google released the fix in the Stable Channel update covered by the Google Chrome Update Announcement. Administrators using Chrome Browser Cloud Management or Group Policy should confirm the TargetVersionPrefix policy permits rollout of 149.0.7827.155 or later.

Workarounds

Where immediate patching is not possible, restrict browsing of untrusted sites through web filtering or isolation technologies.
Enforce Chrome's Site Isolation and ensure the sandbox is not disabled via command-line flags such as --no-sandbox.
Disable or restrict autoplay and media features through enterprise policy on high-risk user groups until updates are deployed.

bash

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

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

# Force-update Chrome on Debian/Ubuntu managed hosts
sudo apt-get update && sudo apt-get install --only-upgrade google-chrome-stable