CVE-2026-17866: Google Chrome Android RCE Vulnerability

CVE-2026-17866 Overview

CVE-2026-17866 is a type confusion vulnerability in the Tab component of Google Chrome on Android. The flaw affects Chrome versions prior to 151.0.7922.72. An attacker who has already compromised the renderer process can leverage a crafted HTML page to attempt a sandbox escape. Google's Chromium team rated the security severity as Medium. The vulnerability is categorized under CWE-843: Access of Resource Using Incompatible Type (Type Confusion).

Critical Impact
Successful exploitation allows a compromised renderer process to escape the Chrome sandbox on Android, breaking a core browser security boundary and enabling broader access to the host device.

Affected Products

Google Chrome on Android prior to 151.0.7922.72
Chromium-based mobile builds inheriting the vulnerable Tab component
Downstream Android browsers packaging pre-151 Chromium code

Discovery Timeline

2026-07-30 - CVE-2026-17866 published to NVD
2026-07-30 - Last updated in NVD database

Technical Details for CVE-2026-17866

Vulnerability Analysis

The vulnerability is a type confusion issue in the Tab component of Chrome on Android. Type confusion occurs when code accesses an object using a type incompatible with its actual type in memory. This mismatch enables reads and writes outside the intended object layout. In this case, the flaw is reachable from within a compromised renderer process, positioning it as a second-stage bug in a browser exploit chain. Chaining a renderer compromise with this issue can potentially yield a sandbox escape, moving code execution from the sandboxed renderer to a higher-privileged browser context on the device.

Root Cause

The root cause is improper type handling within the Tab implementation, tracked under CWE-843. Object type assumptions are not enforced when the Tab component operates on data influenced by the renderer, leading to incompatible-type access. Full technical details are restricted while the fix propagates. See the Chromium Issue Tracker Entry for the upstream record.

Attack Vector

Exploitation requires the attacker to first compromise the renderer process, typically through a separate memory-safety bug triggered by a malicious page. From that foothold, the attacker delivers a crafted HTML page that drives the vulnerable Tab code path to trigger the type confusion. The result is a candidate primitive for escaping the renderer sandbox on Android. Refer to the Google Chrome Desktop Update advisory for release-channel context.

No verified public exploit code or proof-of-concept is available at the time of publication. The vulnerability mechanism is described in prose only.

Detection Methods for CVE-2026-17866

Indicators of Compromise

Chrome for Android renderer processes crashing repeatedly on specific pages, consistent with exploit attempts against Tab internals.
Unexpected child process spawning or privilege transitions from Chrome on Android endpoints.
Outbound connections from mobile devices to attacker infrastructure immediately after loading untrusted HTML content.

Detection Strategies

Inventory Chrome for Android versions across managed mobile devices and flag any build older than 151.0.7922.72.
Correlate browser crash telemetry with subsequent anomalous process or network activity on the same device.
Monitor mobile threat defense logs for exploit-style behavior originating from the Chrome package.

Monitoring Recommendations

Track Chrome version compliance through mobile device management (MDM) reporting on a recurring schedule.
Alert on visits to newly registered or low-reputation domains that serve HTML to Android Chrome clients.
Review Google Play and enterprise app catalog rollout status to confirm the patched Chrome build has reached all managed devices.

How to Mitigate CVE-2026-17866

Immediate Actions Required

Update Google Chrome on Android to version 151.0.7922.72 or later on all managed and personal devices used for work.
Enforce a minimum Chrome version policy through MDM to block or warn on outdated installations.
Restrict browsing to trusted sites on devices that cannot be updated immediately, and prioritize patching high-risk users.

Patch Information

Google addressed the issue in Chrome 151.0.7922.72 for Android. Users should install the update through the Google Play Store or their enterprise app distribution channel. See the Google Chrome Desktop Update release notes and the Chromium Issue Tracker Entry for the associated fix reference.

Workarounds

No vendor-supplied workaround exists; upgrading Chrome is the supported remediation.
Limit exposure by disabling JavaScript for untrusted sites or using Site Isolation-aware enterprise policies where feasible.
Consider alternate browsers with current security patches on devices pending update, and re-enable Chrome once patched.

bash

# Verify installed Chrome version on an Android device via ADB
adb shell dumpsys package com.android.chrome | grep versionName

# Expected output should be 151.0.7922.72 or higher
# versionName=151.0.7922.72