CVE-2026-10910: Type Confusion in Chrome V8 Engine – Arbitrary Code Execution

Technical summary

CVE-2026-10910 is a type confusion flaw in V8, Chrome's JavaScript engine. Type confusion occurs when the engine mishandles object types during compilation or execution, causing it to treat data as a different type than intended. This confusion permits an attacker to break type safety guarantees and corrupt memory in controlled ways. The vulnerability is reachable via remote HTML delivery and, while sandboxed, provides sufficient primitives for arbitrary code execution within that sandbox context. The Chromium security team rated this High severity.

Business impact

Exploitation could result in unauthorized access to sensitive data processed within the browser (emails, credentials, session tokens, personal information), malware installation, credential harvesting, or reconnaissance of internal networks if the browser is used for enterprise applications. For organizations where Chrome is the standard browser, this represents a material risk to employee workstations and any web-based applications they access. The requirement for user interaction (visiting a link) makes phishing and social engineering the likely attack vector.

Affected systems

The vulnerability affects Google Chrome versions prior to 149.0.7827.53 across multiple platforms: Windows, macOS, and Linux. All users running affected Chrome versions are at risk. The underlying operating systems (Windows, macOS, Linux kernel) are not directly vulnerable; they are listed because Chrome runs on them, and successful exploitation could potentially interact with OS-level resources depending on sandbox escape techniques.

Exploitability

Exploitability is moderate-to-high in practice. An attacker must craft a malicious HTML page and convince a user to visit it (via phishing, watering hole, or advertisement), but no authentication or special configuration is required. The sandbox does limit the immediate scope of impact, but sandbox escapes are a known attack path in browser security. Public exploit code is not known to exist as of the advisory publication, but the High severity rating and type confusion class suggest that motivated attackers are likely to develop working exploits. The vulnerability was not flagged for active exploitation in the wild at time of publication.

Remediation

Update Google Chrome to version 149.0.7827.53 or later immediately. On Windows, macOS, and Linux, Chrome's built-in update mechanism should push the patch automatically, though users may need to relaunch the browser. Administrators managing Chrome deployments should enforce the update through group policy, Mobile Device Management (MDM), or equivalent tooling. Until patching is complete, consider restricting access to untrusted websites or enforcing enhanced phishing awareness training.

Patch guidance

Verify that Chrome has been updated to 149.0.7827.53 or later by checking Settings > About Google Chrome, which will display the current version and automatically check for updates. For enterprise deployments, consult the Google Chrome Enterprise Help documentation for deployment strategies and version pinning. Ensure that auto-update is not disabled in your environment. Test patched versions in a non-production environment before full rollout if your organization has custom policies or extensions. Relaunch all browser instances after update to ensure the patch takes effect.

Detection guidance

Monitor Chrome version strings and update status across your fleet using endpoint detection and response (EDR) tools, Mobile Device Management (MDM), or inventory management systems. Look for machines running Chrome versions below 149.0.7827.53. If you have access to network telemetry, monitor for HTML pages or JavaScript payloads designed to trigger type confusion (though signatures for this specific flaw may not yet be publicly available). Behavioral monitoring for sandboxed process anomalies or unexpected child process spawning from the Chrome process may indicate exploitation attempts.

Why prioritize this

This vulnerability merits immediate patching due to its High CVSS score (8.8), remote and unauthenticated attack vector, and the ubiquity of Chrome in enterprise and consumer environments. Although it requires user interaction and is sandboxed, type confusion in JavaScript engines is a well-understood attack surface, and the High severity rating reflects genuine risk. Organizations should prioritize Chrome updates ahead of routine patch cycles.

Risk score, explained

The CVSS score of 8.8 (High) reflects: remote network-based attack vector (AV:N), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), and high impact across confidentiality, integrity, and availability (C:H/I:H/A:H). The user interaction requirement prevents a higher score, but the sandbox-escape potential and ease of delivery via HTML justify the High rating. The vulnerability does not yet appear in the CISA Known Exploited Vulnerabilities catalog, indicating no confirmed active exploitation at publication.

Frequently asked questions