{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-4701",
        "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
        "state": "PUBLISHED",
        "assignerShortName": "mozilla",
        "dateReserved": "2026-03-23T23:22:05.456Z",
        "datePublished": "2026-03-24T12:30:29.700Z",
        "dateUpdated": "2026-05-12T16:54:17.477Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "product": "Firefox",
                    "vendor": "Mozilla",
                    "versions": [
                        {
                            "status": "unaffected",
                            "version": "140.9",
                            "lessThanOrEqual": "140.*",
                            "versionType": "rpm"
                        },
                        {
                            "status": "unaffected",
                            "version": "149",
                            "lessThanOrEqual": "*",
                            "versionType": "rpm"
                        }
                    ]
                },
                {
                    "product": "Thunderbird",
                    "vendor": "Mozilla",
                    "versions": [
                        {
                            "status": "unaffected",
                            "version": "140.9",
                            "lessThanOrEqual": "140.*",
                            "versionType": "rpm"
                        },
                        {
                            "status": "unaffected",
                            "version": "149",
                            "lessThanOrEqual": "*",
                            "versionType": "rpm"
                        }
                    ]
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.",
                    "supportingMedia": [
                        {
                            "type": "text/html",
                            "base64": false,
                            "value": "Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9."
                        }
                    ]
                }
            ],
            "title": "Use-after-free in the JavaScript Engine component",
            "references": [
                {
                    "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2009303"
                },
                {
                    "url": "https://www.mozilla.org/security/advisories/mfsa2026-20/"
                },
                {
                    "url": "https://www.mozilla.org/security/advisories/mfsa2026-22/"
                },
                {
                    "url": "https://www.mozilla.org/security/advisories/mfsa2026-23/"
                },
                {
                    "url": "https://www.mozilla.org/security/advisories/mfsa2026-24/"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Gary Kwong"
                }
            ],
            "providerMetadata": {
                "orgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
                "shortName": "mozilla",
                "dateUpdated": "2026-04-13T13:50:19.589Z"
            }
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-416",
                                "lang": "en",
                                "description": "CWE-416 Use After Free"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 9.8,
                            "attackVector": "NETWORK",
                            "baseSeverity": "CRITICAL",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                            "integrityImpact": "HIGH",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "HIGH",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "HIGH"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-26T13:04:34.007549Z",
                                "id": "CVE-2026-4701",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-05-12T16:54:17.477Z"
                }
            }
        ]
    }
}