CVE-2026-8543

Description

Out of bounds read in FileSystem in Google Chrome on Mac prior to 148.0.7778.168 allowed a remote attacker who convinced a user to engage in specific UI gestures to obtain potentially sensitive information from process memory via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

5.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

No configuration data available.

Google Chrome (Mac) < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!--
PoC for CVE-2026-8543 (Conceptual)
This PoC demonstrates the trigger mechanism via UI gesture.
-->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8543 PoC</title>
    <style>
        button { padding: 20px; font-size: 16px; }
    </style>
</head>
<body>
    <h1>CVE-2026-8543 FileSystem OOB Read PoC</h1>
    <p>Click the button below to trigger the specific UI gesture.</p>
    <button id="triggerBtn">Engage UI Gesture</button>
    <pre id="output"></pre>

    <script>
        document.getElementById('triggerBtn').addEventListener('click', async () => {
            try {
                // Attempt to interact with FileSystem API to trigger the bug
                // Note: Exploitability depends on specific Chrome version < 148.0.7778.168
                const root = await navigator.storage.getDirectory();
                
                // Simulate the crafted operation that leads to Out of Bounds Read
                // The exact API call sequence is obfuscated here for safety
                console.log("Attempting to trigger OOB read in FileSystem...");
                
                // Hypothetical trigger function
                // trigger_oob_read(root);

                document.getElementById('output').textContent = "Interaction logged. Check browser console for details.";
            } catch (error) {
                console.error("PoC Execution Error:", error);
                document.getElementById('output').textContent = "Error: " + error.message;
            }
        });
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8543
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8543
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8543/
[4] VulDB https://vuldb.com/cve/CVE-2026-8543
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/497095799

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8543", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:15.173", "lastModified": "2026-05-14T22:16:48.420", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds read in FileSystem in Google Chrome on Mac prior to 148.0.7778.168 allowed a remote attacker who convinced a user to engage in specific UI gestures to obtain potentially sensitive information from process memory 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:U/C:H/I:N/A:N", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.6, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/497095799", "source": "[email protected]"}]}}