CVE-2026-10022: Chrome V8 Type Confusion Vulnerability in Extensions

Technical summary

CVE-2026-10022 stems from a type confusion vulnerability in V8, Chrome's JavaScript engine. Type confusion occurs when code mishandles object types, allowing an attacker to treat data of one type as another—bypassing type safety checks. In this case, a crafted Chrome extension can trigger the type confusion condition, leading to out-of-bounds memory access or unintended object reuse within the V8 sandbox context. The vulnerability is classified under CWE-843 (Access of Resource Using Incompatible Type). The flaw does not require user interaction beyond the initial extension installation; once installed, the malicious code can execute automatically. Chrome's sandbox architecture limits the impact to the renderer process rather than the entire system, but sandbox escapes or privilege escalation within the renderer remain a concern if chained with other vulnerabilities.

Business impact

Organizations must weigh the likelihood of users installing a malicious extension against the sensitivity of data accessible within the browser. For enterprises with strict extension policies and employee awareness training, the risk is lower. However, sectors handling high-value intellectual property, financial data, or personal information face elevated risk if attackers can socially engineer extension distribution. Successful exploitation could lead to credential theft, session hijacking, or exfiltration of sensitive communications and documents. The requirement for extension installation means this is not a mass-exploitation risk, but targeted phishing campaigns or compromised extension marketplaces could deliver the payload. Remediation is straightforward and available, making delayed patching a controllable business decision rather than a crisis.

Affected systems

All versions of Google Chrome prior to 148.0.7778.216 running on Windows, macOS, or Linux are vulnerable. The vulnerability is not specific to any particular architecture or configuration; any user running an affected Chrome version who installs a malicious extension is at risk. The CVE does not affect other Chromium-based browsers (Edge, Brave, etc.) unless they ship the same vulnerable V8 version without the fix—verify with those vendors. Non-Chrome browsers such as Firefox, Safari, and Opera are unaffected. Users running Chrome 148.0.7778.216 or later have received the patch and are protected.

Exploitability

Exploitation requires two preconditions: (1) the attacker must distribute a malicious Chrome extension, and (2) the target user must install it. No network spray or drive-by attack is possible; the extension installation is the attack surface. This limitation significantly reduces exploitability at scale. However, exploitability within a targeted group is moderate to high: extensions can be hosted on third-party marketplaces, distributed via email, or promoted through social engineering. Once installed, code execution is reliable due to the type confusion condition being reproducible. A motivated attacker can craft proof-of-concept code with relative ease, and public disclosure of the type confusion bug increases the likelihood of exploit development. The vulnerability is not yet listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, suggesting active exploitation has not been widespread as of the publication date.

Remediation

Update Google Chrome to version 148.0.7778.216 or later. Chrome's automatic update mechanism will deliver the patch to most users within days of release; however, administrators should verify deployment in managed environments. Beyond patching, enforce extension policies via Group Policy (Windows), configuration profiles (macOS), or Mobile Device Management (MDM) tools to restrict users' ability to install extensions. Restrict installation to a curated allowlist of approved extensions and block sideloading of unpacked extensions. Educate users on the risks of installing extensions from untrusted sources. For high-security environments, disable extensions entirely or use extension sandboxing features if available.

Patch guidance

Google Chrome auto-updates are enabled by default. Users can manually check for updates by opening Chrome menu > Settings > About Chrome, which will automatically check for and install any pending updates. Organizations should monitor Chrome Enterprise release notes and test patched versions in non-production environments before rolling out to all users. Verify that update deployment has completed across your fleet using Chrome's reporting and management tools. No workarounds are available; patching is the only remediation. Rollback is not recommended unless patched versions exhibit critical regressions, which would be rare for a type confusion fix in V8.

Detection guidance

Detection of exploitation is challenging because the malicious extension runs within the sandbox and uses legitimate browser APIs. Monitor for anomalous Chrome extension installations, particularly unsigned or unpacked extensions, using endpoint detection and response (EDR) tools. Look for extensions that request unusual permissions (broad file access, network access, credential interception). Network monitoring for suspicious data exfiltration from browser processes to unknown destinations may indicate active exploitation. Log extension install events via browser management platforms. Behavioral analytics could flag unexpected memory access patterns within V8, but this would require deep instrumentation. Prioritize detection of the malicious extension distribution vector (compromised marketplaces, phishing links) rather than post-exploitation forensics.

Why prioritize this

Patch urgently, but not critically. The CVSS score of 7.5 (HIGH) reflects the severity of code execution, but the attack vector (requiring extension installation) limits exposure. Prioritize patching for users who frequently install browser extensions or work in high-risk roles (executives, developers, finance). Standard users with extension policies enforced can be patched on a normal release cycle. The lack of KEV listing suggests this is not yet a priority target for ransomware groups or state-sponsored actors, but that status could change as the vulnerability ages and exploit code matures. Organizations should complete patching within 30 days unless they have defense-in-depth controls that mitigate the extension installation vector.

Risk score, explained

The CVSS v3.1 score of 7.5 reflects a high-severity vulnerability due to the potential for arbitrary code execution with high impact on confidentiality, integrity, and availability. The vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H indicates network attack surface (AV:N), but with high attack complexity (AC:H) due to the need to craft a malicious extension and social engineer installation. User interaction is required (UI:R). The scope is unchanged (S:U), meaning the impact is confined to the vulnerable component (the browser sandbox). The HIGH rating is justified; however, real-world risk is moderated by the requirement for user action and the availability of immediate patches, making this more of a medium-priority patching task for most organizations rather than a critical incident response trigger.

Frequently asked questions