CVE-2026-5280: Google Chrome Use-After-Free Vulnerability

CVE-2026-5280 Overview

CVE-2026-5280 is a use-after-free vulnerability in the WebCodecs component of Google Chrome prior to version 146.0.7680.178. This memory corruption flaw allows a remote attacker to execute arbitrary code inside a sandbox by tricking a victim into visiting a maliciously crafted HTML page. The WebCodecs API, which provides low-level access to individual frames of video streams and chunks of audio, contains improper memory handling that can be exploited through carefully constructed web content.

Critical Impact
Successful exploitation enables remote code execution within the Chrome sandbox, potentially allowing attackers to compromise browser integrity, steal sensitive data, or chain with additional sandbox escape vulnerabilities for full system compromise.

Affected Products

Google Chrome prior to version 146.0.7680.178
Google Chrome on Apple macOS
Google Chrome on Linux
Google Chrome on Microsoft Windows

Discovery Timeline

2026-04-01 - CVE-2026-5280 published to NVD
2026-04-02 - Last updated in NVD database

Technical Details for CVE-2026-5280

Vulnerability Analysis

This vulnerability is classified as CWE-416 (Use After Free), a dangerous memory corruption issue where the application continues to reference memory after it has been freed. In the context of Google Chrome's WebCodecs implementation, this occurs when handling certain operations related to video or audio frame processing.

When a WebCodecs object is deallocated but a reference to that memory is still retained and subsequently used, the attacker can potentially control the contents of the freed memory region. By carefully crafting an HTML page that triggers specific sequences of WebCodecs API calls, an attacker can manipulate memory allocation patterns to place controlled data in the freed memory location, ultimately hijacking program execution flow.

The attack requires user interaction—specifically, the victim must navigate to a malicious webpage—but no privileges are required on the target system. The vulnerability affects the confidentiality, integrity, and availability of the browser process, though exploitation is initially contained within Chrome's sandbox.

Root Cause

The root cause stems from improper lifecycle management of WebCodecs objects within the Chrome rendering engine. When certain API operations are performed in a specific sequence, the internal reference counting or garbage collection mechanism fails to properly track object lifetimes. This results in a dangling pointer scenario where the code attempts to access a WebCodecs-related object that has already been freed from memory.

The WebCodecs API handles complex multimedia processing operations, and the interaction between JavaScript garbage collection and native C++ object management creates opportunities for use-after-free conditions if not carefully synchronized.

Attack Vector

The attack is delivered via a network-accessible malicious HTML page. The exploitation flow follows this pattern:

Initial Access: Attacker hosts or injects malicious HTML/JavaScript content on a web page
Victim Interaction: Target user navigates to the malicious page (via phishing link, malvertising, or compromised legitimate site)
Trigger Sequence: Malicious JavaScript initiates specific WebCodecs API calls designed to trigger the use-after-free condition
Memory Manipulation: Attacker leverages heap spraying or other memory grooming techniques to place controlled data in the freed memory region
Code Execution: When the dangling pointer is dereferenced, attacker-controlled data is interpreted as code or function pointers, enabling arbitrary code execution within the renderer sandbox

The vulnerability can be chained with sandbox escape exploits for complete system compromise. For detailed technical information, refer to the Chromium Issue Tracker Entry.

Detection Methods for CVE-2026-5280

Indicators of Compromise

Unusual WebCodecs API call patterns or error messages in browser console logs
Unexpected Chrome renderer process crashes or restarts, particularly when viewing multimedia content
Memory allocation anomalies or heap corruption indicators in browser crash dumps
Network requests to known malicious domains serving exploit pages

Detection Strategies

Monitor for Chrome process crashes with signatures related to WebCodecs or media processing components
Deploy browser-based security extensions that can detect and block suspicious JavaScript execution patterns
Implement network-level inspection for HTML pages containing obfuscated JavaScript targeting multimedia APIs
Enable Chrome's extended crash reporting to capture detailed forensic information

Monitoring Recommendations

Review browser crash reports for patterns indicating use-after-free exploitation attempts
Monitor endpoint detection logs for unusual Chrome process behavior or memory access violations
Track network traffic for connections to recently registered or suspicious domains that may host exploit pages
Implement alerting on any detected exploitation attempts targeting browser components

How to Mitigate CVE-2026-5280

Immediate Actions Required

Update Google Chrome to version 146.0.7680.178 or later immediately across all systems
Enable automatic Chrome updates to ensure timely patching of future vulnerabilities
Consider temporarily disabling JavaScript on untrusted sites if patch deployment is delayed
Educate users about phishing risks and the importance of avoiding suspicious links

Patch Information

Google has released a security update addressing this vulnerability in Chrome version 146.0.7680.178. The patch corrects the memory management issue in the WebCodecs component, ensuring proper object lifecycle tracking and preventing the use-after-free condition.

Organizations should prioritize updating Chrome installations across their environment. The update is available through Chrome's built-in update mechanism and can be verified by navigating to chrome://settings/help. For enterprise deployments, administrators can push the update through group policies or endpoint management solutions.

For official patch details, see the Google Chrome Update Announcement.

Workarounds

Restrict access to untrusted websites until the patch can be applied
Use browser isolation technologies to contain potential exploitation in high-risk environments
Deploy web filtering solutions to block access to known malicious domains
Consider using alternative browsers temporarily if Chrome cannot be immediately updated

bash

# Verify Chrome version on Linux/macOS
google-chrome --version
# Expected: Google Chrome 146.0.7680.178 or higher

# Force Chrome update check (Windows - run as Administrator)
# Navigate to chrome://settings/help in browser to trigger update

# Enterprise deployment via group policy
# Configure AutoUpdateCheckPeriodMinutes to ensure frequent update checks