CVE-2026-11683: Google Chrome Use After Free Vulnerability

CVE-2026-11683 Overview

CVE-2026-11683 is a use-after-free vulnerability [CWE-416] in the WebCodecs component of Google Chrome prior to version 149.0.7827.103. A remote attacker can exploit the flaw by serving a crafted HTML page to a target user. Successful exploitation allows arbitrary code execution inside the Chrome renderer sandbox. The flaw affects Chrome on Windows, macOS, and Linux. Google rates the Chromium security severity as High and addressed the issue in the Stable channel desktop update.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome renderer sandbox by luring users to a malicious web page, providing a foothold for sandbox escape chains.

Affected Products

Google Chrome prior to 149.0.7827.103
Chrome desktop on Microsoft Windows
Chrome desktop on Apple macOS and Linux

Discovery Timeline

2026-06-09 - CVE-2026-11683 published to NVD
2026-06-09 - Last updated in NVD database

Technical Details for CVE-2026-11683

Vulnerability Analysis

The vulnerability resides in WebCodecs, the Chrome API that provides low-level access to encoders and decoders for audio and video frames. A use-after-free condition occurs when code retains a reference to a WebCodecs object after its underlying memory has been freed. An attacker who triggers the dangling reference can reuse the freed allocation with attacker-controlled data. This corrupts object state used during media frame processing inside the renderer process.

The attack requires user interaction, specifically loading a crafted HTML page in a vulnerable Chrome build. Exploitation yields code execution inside the renderer sandbox, which adversaries typically pair with a separate sandbox-escape primitive to compromise the host. The Chromium issue tracker entry for this defect is referenced as issue 517129549.

Root Cause

The defect is a classic use-after-free [CWE-416] in WebCodecs object lifetime management. JavaScript callable into the WebCodecs interface can release an encoder, decoder, or frame object while another code path still holds a raw pointer to the freed allocation. Subsequent operations dereference that pointer, allowing attacker-shaped heap data to drive control flow or memory writes.

Attack Vector

The attack vector is network based and requires user interaction. The attacker hosts a crafted HTML page that invokes WebCodecs APIs in a sequence that triggers the dangling reference. When a victim visits the page, the renderer process executes the malicious sequence and the attacker gains code execution inside the sandboxed renderer.

No verified public exploit code is available for CVE-2026-11683. For technical specifics, refer to the Chromium Issue Tracker Entry and the Google Chrome Update Announcement.

Detection Methods for CVE-2026-11683

Indicators of Compromise

Chrome renderer process crashes referencing WebCodecs frames, decoders, or encoders in crash dumps
Browser navigation logs showing visits to unfamiliar sites immediately preceding renderer instability
Outbound connections from chrome.exe child renderer processes to attacker infrastructure after a crash event
Endpoint telemetry showing child processes spawned by Chrome renderer instances post-visit

Detection Strategies

Inventory Chrome installations and alert when versions are below 149.0.7827.103 on Windows, macOS, or Linux endpoints
Hunt for renderer crashes correlated with WebCodecs API usage in browser telemetry and Windows Error Reporting
Monitor for anomalous process creation chains originating from Chrome renderer processes
Inspect proxy and DNS logs for connections to newly registered or low-reputation domains hosting media-heavy HTML

Monitoring Recommendations

Forward browser version inventory and crash telemetry to a centralized data lake for version-drift detection
Enable EDR behavioral rules for post-exploitation actions following browser renderer crashes
Track Chrome auto-update health across the fleet and surface endpoints that fail to apply the patch
Correlate web proxy data with endpoint process telemetry to identify users who visited suspect pages and subsequently exhibited anomalous Chrome behavior

How to Mitigate CVE-2026-11683

Immediate Actions Required

Update Google Chrome to version 149.0.7827.103 or later on all Windows, macOS, and Linux endpoints
Verify enterprise auto-update policies are enabled and not blocked by group policy or MDM configuration
Restart Chrome on all endpoints after the update so the patched binary is loaded
Audit Chromium-based managed browsers and ensure they incorporate the fixed Chromium build

Patch Information

Google released the fix in the Stable channel desktop update covered by the Google Chrome Update Announcement. Administrators should ensure all managed Chrome instances are running 149.0.7827.103 or later. Chromium-based browsers that rebase against fixed Chromium revisions should also be updated as their vendors publish releases.

Workarounds

No vendor-supplied workaround replaces the patch; prioritize updating Chrome
Restrict browsing to trusted sites via enterprise web filtering until the update is deployed
Consider temporarily disabling the WebCodecs API via enterprise policy where business workflows allow
Enforce site isolation and renderer sandboxing policies to limit blast radius if exploitation occurs

bash

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

# Force update check on macOS
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --check-for-update-interval=1

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