CVE-2026-10906: Chrome WebAuthentication Use-After-Free Heap Corruption

Technical summary

CVE-2026-10906 is a use-after-free (CWE-416) vulnerability in Chrome's WebAuthentication subsystem. The flaw occurs when the browser references memory that has already been freed, potentially corrupting the heap. The vulnerability requires user interaction via specific UI gestures on a crafted HTML page. The attack vector is network-based; no local access or special privileges are required. The high CVSS score of 7.5 reflects the combination of network accessibility, required but achievable user interaction, and the potential for high confidentiality, integrity, and availability impact.

Business impact

Exploitation of this vulnerability could allow attackers to compromise user systems by executing arbitrary code within the Chrome process or causing denial of service. Given that WebAuthentication is often used for credential management and secure authentication flows, successful attacks could lead to credential theft, unauthorized access to sensitive applications, or lateral movement within corporate networks. The requirement for user interaction makes this a vector for spear-phishing and targeted social engineering campaigns.

Affected systems

Google Chrome prior to version 149.0.7827.53 is directly affected. The vulnerability is platform-agnostic and affects Chrome running on Windows, macOS, and Linux environments. Any organization or individual using affected Chrome versions on these operating systems is potentially at risk.

Exploitability

The vulnerability requires network access and user interaction—specifically, a user must engage with specific UI gestures on a crafted webpage to trigger heap corruption. While this raises the bar slightly compared to no-interaction exploits, convincing users to click or interact with a malicious page is a well-established attack vector in web-based threats. The Chromium security team rated this as High severity, and it is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, though this does not rule out future exploitation in the wild.

Remediation

Organizations should prioritize updating Google Chrome to version 149.0.7827.53 or later across all endpoints. Chrome's auto-update feature typically handles deployment, but administrators managing enterprise deployments should verify successful rollout. Users should verify their Chrome version in Settings > About Chrome, which will trigger an automatic check and install if updates are available.

Patch guidance

Update Google Chrome to version 149.0.7827.53 or any later stable release. For enterprise environments, verify patch deployment through your device management tools and confirm that no endpoints remain on versions prior to 149.0.7827.53. Monitor for any browser crashes or unexpected behavior immediately following the update, which could indicate incomplete patching or environmental issues. As with all security patches, test in a limited environment first if your organization maintains strict change-control protocols.

Detection guidance

Monitor for Chrome crashes or segmentation faults in security logs, particularly those involving the WebAuthentication API or credential handling flows. Endpoint Detection and Response (EDR) tools should flag attempts to exploit heap corruption vulnerabilities. Network-based detection is difficult since the attack requires crafted HTML; however, monitoring for suspicious authentication failures or anomalous browser behavior following user visits to unknown external sites may provide indirect signals. Consider alerting on any users accessing unverified or suspicious HTML pages shortly before a browser crash.

Why prioritize this

This vulnerability merits rapid remediation due to its high CVSS score, network accessibility, and presence in an authentication subsystem. While user interaction is required, the attack surface is broad—any malicious website or compromised legitimate website could serve the exploit payload. WebAuthentication features are increasingly used in zero-trust and passwordless authentication architectures; compromise of this subsystem is particularly concerning for organizations relying on these modern security postures.

Risk score, explained

The CVSS 3.1 score of 7.5 (HIGH) reflects: (1) network-based attack vector requiring no privileges, (2) attack complexity that is high due to the specific UI gestures required, (3) required user interaction, (4) impact limited to the affected user's system only (unchanged scope), and (5) high potential impact across confidentiality, integrity, and availability due to arbitrary code execution and heap corruption. The score appropriately penalizes the exploit for requiring user interaction but remains elevated due to the severity of potential outcomes.

Frequently asked questions