CVE-2026-13821: Google Chrome Use After Free Vulnerability

CVE-2026-13821 Overview

CVE-2026-13821 is a use-after-free vulnerability in the Canvas component of Google Chrome versions prior to 150.0.7871.47. A remote attacker can exploit this flaw by serving a crafted HTML page to a targeted user. Successful exploitation results in arbitrary code execution within the Chrome renderer sandbox. Google classifies the Chromium security severity as High.

The vulnerability affects Chrome across Windows, macOS, and Linux desktop platforms. It requires only user interaction with a malicious web page, making it viable for drive-by attacks, malvertising, and watering-hole campaigns. The flaw is tracked under CWE-416: Use After Free.

Critical Impact
Remote attackers can execute arbitrary code inside the Chrome renderer sandbox by convincing a user to visit a crafted HTML page.

Affected Products

Google Chrome versions prior to 150.0.7871.47
Chrome desktop builds on Microsoft Windows
Chrome desktop builds on Apple macOS and Linux

Discovery Timeline

2026-06-30 - CVE-2026-13821 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-13821

Vulnerability Analysis

The flaw resides in Chrome's Canvas implementation, which handles 2D graphics rendering for HTML <canvas> elements. A use-after-free condition occurs when the browser continues to reference a Canvas-related object in memory after that object has been freed. An attacker who reclaims the freed memory region with attacker-controlled data can hijack execution flow when the dangling pointer is dereferenced.

Exploitation requires a user to load a crafted HTML page under attacker control. Code execution is contained within the Chrome renderer sandbox, but adversaries typically chain such bugs with sandbox escape vulnerabilities to achieve full compromise of the host. See the Chromium Issue Tracker Entry for upstream tracking.

Root Cause

The root cause is improper lifetime management of a heap-allocated Canvas object [CWE-416]. Code paths retain references to memory that has already been released by the allocator, permitting an attacker to trigger a dereference after the memory has been reused for attacker-shaped data.

Attack Vector

The attack vector is network-based and requires user interaction. An attacker hosts a crafted HTML page that triggers the specific Canvas allocation and free sequence, then reclaims the freed slot with a controlled payload. When Chrome accesses the dangling reference, the attacker gains control of a virtual function call or object field, leading to arbitrary code execution in the renderer process.

No public proof-of-concept is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-13821

Indicators of Compromise

Chrome renderer process crashes or unexpected child process spawns following visits to untrusted web pages.
Outbound connections from chrome.exe renderer processes to newly registered or low-reputation domains hosting HTML content.
Anomalous memory allocation patterns or heap grooming activity observed in Chrome telemetry.

Detection Strategies

Inventory endpoints running Chrome versions below 150.0.7871.47 using software asset management or EDR telemetry.
Monitor process trees where Chrome renderer processes spawn shells, script interpreters, or unexpected binaries.
Alert on Chrome renderer crashes with access-violation exit codes, which can indicate exploitation attempts against memory corruption bugs.

Monitoring Recommendations

Ingest Chrome update status and browser version data into a central SIEM to track patch compliance.
Correlate web proxy logs with endpoint process events to identify users landing on suspicious HTML pages immediately before Chrome instability.
Enable browser-based reporting through Chrome Enterprise policies to capture crash and exploit reproducer telemetry.

How to Mitigate CVE-2026-13821

Immediate Actions Required

Update Google Chrome to version 150.0.7871.47 or later on all Windows, macOS, and Linux endpoints.
Restart Chrome after applying the update so the patched binary takes effect on all renderer processes.
Push the update through enterprise management tools such as Chrome Browser Cloud Management, Microsoft Intune, or Jamf.

Patch Information

Google released the fix in the Chrome Stable channel update documented in the Chrome Security Update Blog. Upstream tracking is available in the Chromium Issue Tracker Entry. Chromium-based browsers that inherit the Blink and Skia rendering stack should apply corresponding vendor updates.

Workarounds

Restrict browsing to trusted sites through enterprise web filtering until patches are deployed across the fleet.
Enforce Chrome's Site Isolation and enhanced sandbox policies via SitePerProcess and related enterprise policies.
Deploy web content filtering or a secure web gateway to block known malicious HTML delivery infrastructure.

bash

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

# Force update check on managed Windows endpoints via Chrome Enterprise
"%ProgramFiles%\Google\Chrome\Application\chrome.exe" --check-for-update-interval=1