CVE-2026-11262: Chrome TabStrip Use-After-Free RCE Vulnerability

Technical summary

The vulnerability is a use-after-free (CWE-416) in the TabStrip handling code within Chrome's rendering engine. Use-after-free bugs occur when an object or memory region is accessed after it has already been freed, allowing attackers to corrupt memory state, leak sensitive data, or execute arbitrary instructions. In this case, a specially crafted HTML page triggers premature deallocation of a TabStrip object, and subsequent interactions with that same object cause the freed memory to be interpreted and executed as code. The attack vector is network-based with low complexity; exploitation requires only social engineering to convince a user to visit the malicious page (UI:R in the CVSS vector).

Business impact

Successful exploitation enables complete compromise of the affected Chrome browser process, including theft of sensitive data (passwords, session cookies, personal files accessible to the browser), unauthorized modifications to web content in real time, and potential lateral movement to other systems if the browser is running with elevated privileges or in an environment with weak network segmentation. For organizations where Chrome is the primary browser or where employees access sensitive web applications, this creates significant risk of data exfiltration and credential theft. The attack surface is broad: any user browsing untrusted content or falling victim to drive-by malware distribution is at risk.

Affected systems

Google Chrome prior to version 149.0.7827.53 on Windows, macOS, and Linux is directly affected. While the CVE listing mentions Apple macOS, Microsoft Windows, and Linux Kernel as affected platforms, the vulnerability is fundamentally a Chrome application-level issue; the platform itself is not vulnerable, but Chrome installations on these operating systems are. Organizations running earlier Chrome versions on any of these platforms should prioritize updates. Chrome's auto-update mechanism typically deploys patches within days, but unmanaged or corporate-locked instances may lag.

Exploitability

The vulnerability is practical to exploit but requires user participation. An attacker must craft a malicious HTML page and distribute it—via phishing emails, malicious advertisements, compromised legitimate websites, or other social engineering—to trigger visits. No special tools, specific browser extensions, or zero-click vectors are needed. Once a user visits the page, the exploit executes silently without additional prompts. The CVSS vector (AV:N/AC:L/PR:N/UI:R) correctly captures this: network-accessible, low attack complexity, no privileges required, user interaction needed. The flaw has not been added to CISA's Known Exploited Vulnerabilities (KEV) catalog as of the modification date, but this does not indicate low real-world risk—KEV inclusion typically lags active exploitation by weeks or months.

Remediation

Immediately update Google Chrome to version 149.0.7827.53 or later. Chrome's built-in auto-update mechanism should handle this automatically on most systems, though administrators should verify deployment in managed environments. Users can manually check for updates via Chrome menu > Settings > About Chrome. For organizations with older Chrome instances or offline networks, download the latest Chrome installer from google.com/chrome and deploy via endpoint management tools. No workarounds exist; patching is the only mitigation.

Patch guidance

Deploy Chrome 149.0.7827.53 or later as soon as possible. For enterprise environments: (1) Verify your Chrome update policy is enabled and functioning; (2) If using Chrome extensions or kiosk-mode deployments, test the update in a non-production environment first for compatibility; (3) Confirm rollout across all managed devices within 48–72 hours; (4) If auto-update is disabled, manually trigger updates via Group Policy (Windows) or MDM (macOS/Linux). For individual users: open Chrome, navigate to Settings > About Chrome, and allow the update to install; restart the browser when prompted.

Detection guidance

Monitor for signs of exploitation: (1) Unexpected child processes spawned by Chrome or Chrome subprocesses (e.g., cmd.exe, PowerShell, bash from a Chromium renderer process); (2) Unusual file creation or modification in user temp directories or Documents folders immediately after Chrome visits; (3) Suspicious network connections (DNS queries, HTTP POST requests) from Chrome processes to external IPs; (4) Crashes or restarts of Chrome following visits to untrusted sites. Use endpoint detection and response (EDR) tools to capture process creation telemetry and memory access patterns. Browser crash reports and Chrome's built-in Safe Browsing logs may also reveal attempted exploitation. Network-level detection is difficult without decryption of HTTPS traffic, but watching for post-exploitation C2 communication is feasible.

Why prioritize this

Although Chromium rated this as 'Low' severity internally, the CVSS 3.1 score of 8.8 (HIGH) accurately reflects the risk: remote, unauthenticated code execution with high impact. Chrome's ubiquity in both consumer and enterprise environments makes this a significant attack surface. The requirement for user interaction (visiting a malicious page) is a common social engineering vector. Organizations should treat this as a priority update, particularly for systems used by employees who access sensitive financial, legal, or healthcare applications. The absence of KEV listing does not reduce urgency; it suggests active exploitation has not yet been weaponized at scale, but the window to patch before widespread attacks is narrow.

Risk score, explained

The CVSS 3.1 score of 8.8 (HIGH) is justified by: (1) Attack Vector: Network—no proximity or physical access required; (2) Attack Complexity: Low—crafting a malicious HTML page is straightforward; (3) Privileges Required: None—the attacker does not need any authentication or prior foothold; (4) User Interaction: Required—social engineering or accidental browsing is the trigger; (5) Scope: Unchanged—the impact is confined to the Chrome process and data accessible to it; (6) Confidentiality Impact: High—an attacker can exfiltrate sensitive data; (7) Integrity Impact: High—an attacker can modify pages, inject content, or alter stored data; (8) Availability Impact: High—an attacker can crash Chrome or lock up system resources. The 'Low' Chromium severity likely reflects internal triage based on additional context (e.g., sandboxing effectiveness) not captured in the CVE, but for organizations lacking Chrome's advanced mitigations or relying on Chrome for critical tasks, the real-world risk is substantial.

Frequently asked questions