CVE-2026-8558

Description

Out of bounds write in Fonts in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security severity: High)

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 < 148.0.7778.168

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- Proof of Concept for CVE-2026-8558 -->
<!-- This is a conceptual PoC demonstrating the trigger mechanism -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-8558 PoC</title>
    <style>
        @font-face {
            font-family: 'ExploitFont';
            src: url('malicious_font.ttf'); /* Malicious font data triggering OOB write */
        }
        body {
            font-family: 'ExploitFont';
        }
    </style>
</head>
<body>
    <h1>Testing Chrome Fonts OOB Write</h1>
    <p>If Chrome crashes or executes code in sandbox, the vulnerability is triggered.</p>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8558
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8558
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8558/
[4] VulDB https://vuldb.com/cve/CVE-2026-8558
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/503425922

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8558", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:17.773", "lastModified": "2026-05-14T22:16:49.270", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out of bounds write in Fonts in Google Chrome prior to 148.0.7778.168 allowed a remote attacker to execute arbitrary code inside a sandbox 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: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-787"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/503425922", "source": "[email protected]"}]}}