CVE-2026-10013: Use-After-Free in Chrome WebCodecs – Patch Guide & Risk Assessment

Technical summary

CVE-2026-10013 is a use-after-free condition (CWE-416) in the WebCodecs implementation within Chromium. Use-after-free vulnerabilities occur when a program references memory that has been deallocated, potentially allowing an attacker to manipulate that memory space to achieve arbitrary code execution. In this case, the flaw is triggered via a crafted HTML page, suggesting the vulnerability can be exploited through standard web delivery mechanisms. The attack occurs within Chrome's sandbox environment, which provides a containment layer but does not eliminate the security impact. Google assigned this a High severity rating within their security classification system.

Business impact

Successful exploitation could allow an attacker to execute arbitrary code within an affected user's Chrome browser sandbox. While sandboxed, this represents a foothold for further attacks, particularly if combined with additional vulnerabilities to escape the sandbox. Organizations should be concerned about this as a potential attack vector for delivering malware, stealing credentials, or gaining persistent browser compromise. The requirement for user interaction (visiting a malicious website) makes social engineering or drive-by download campaigns plausible attack scenarios. Given that Chrome is widely deployed across both enterprise and consumer environments, this affects a significant attack surface.

Affected systems

Google Chrome versions prior to 148.0.7778.216 are vulnerable. The vulnerability is platform-agnostic and affects Chrome running on Windows, macOS, and Linux. While the provided data references these operating systems, the primary affected component is Chrome itself; patching Chrome addresses the vulnerability regardless of OS. Organizations running Chrome on any supported platform should prioritize updating.

Exploitability

The attack requires user interaction—specifically, a user must visit a malicious website or view a crafted HTML page. No authentication is required, and the attack can be delivered remotely over the network. The CVSS score of 8.8 (High) reflects the high impact (confidentiality, integrity, and availability compromise within the sandbox) combined with low attack complexity and the requirement for user interaction. While not currently listed in the Known Exploited Vulnerabilities catalog, the technical nature of use-after-free bugs and their prevalence in browser exploitation makes this a credible attack vector. Organizations should assume capability development is likely or already underway.

Remediation

The primary remediation is to update Google Chrome to version 148.0.7778.216 or later. Users should enable automatic updates if not already configured. For organizations managing Chrome deployments, ensure that update policies are configured to deploy the patched version promptly. Additionally, consider implementing web content filtering and user awareness training to reduce the likelihood of users visiting malicious sites. Enterprise administrators should verify update status across all endpoints within 30 days of patch availability.

Patch guidance

Update Chrome to version 148.0.7778.216 or later. On Windows, macOS, and Linux, Chrome typically updates automatically when restarted. To manually check for updates, open Chrome, navigate to Settings > About Chrome, and verify the displayed version matches the patched build or higher. For enterprise deployments, use your organization's Chrome management policies or MDM solution to enforce updates across managed devices. Verify patched versions are deployed before considering this vulnerability remediated. Organizations should test updates in a staging environment if running custom Chrome configurations.

Detection guidance

Monitor Chrome version numbers across your environment using endpoint detection and response (EDR) solutions, mobile device management (MDM), or asset inventory tools. Flag any instances running versions prior to 148.0.7778.216. Network-level detection is limited since the attack occurs within the browser; however, behavioral monitoring for unusual child processes spawned by Chrome, unexpected memory corruption, or sandbox escape attempts may provide signals. Check browser telemetry and crash logs for WebCodecs-related failures or suspicious behavior patterns. Web proxy logs should be reviewed for access to known malicious or phishing domains that might distribute this exploit.

Why prioritize this

This vulnerability merits high-priority patching due to the combination of remote exploitability, user-interaction requirement (common in real-world attacks), high impact severity (8.8 CVSS), and the ubiquity of Chrome in both enterprise and consumer environments. Use-after-free vulnerabilities in browser engines have a strong historical precedent for weaponization. The WebCodecs component is a modern, complex subsystem likely to be targeted by advanced threat actors. Although currently not on the KEV list, that status can change. Organizations should treat this as a week-1 priority.

Risk score, explained

The 8.8 CVSS score reflects: Network-based attack vector (AV:N), low attack complexity (AC:L), no privilege requirement (PR:N), but requiring user interaction (UI:R). The impact vector shows high compromise across confidentiality, integrity, and availability (C:H/I:H/A:H), though scoped to the sandbox boundary (S:U). While sandboxing reduces real-world impact compared to unrestricted code execution, the score appropriately weights the technical severity of arbitrary code execution as a High-severity finding. Organizations should not discount this due to the sandbox; assume attacker capability to chain vulnerabilities.

Frequently asked questions