{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-33993",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-03-24T22:20:06.212Z",
        "datePublished": "2026-03-27T22:14:03.495Z",
        "dateUpdated": "2026-03-30T15:45:18.660Z"
    },
    "containers": {
        "cna": {
            "title": "Locutus has Prototype Pollution via __proto__ Key Injection in unserialize()",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1321",
                            "lang": "en",
                            "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6.9,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/locutusjs/locutus/security/advisories/GHSA-4mph-v827-f877",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/locutusjs/locutus/security/advisories/GHSA-4mph-v827-f877"
                },
                {
                    "name": "https://github.com/locutusjs/locutus/pull/597",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/locutusjs/locutus/pull/597"
                },
                {
                    "name": "https://github.com/locutusjs/locutus/commit/345a6211e1e6f939f96a7090bfeff642c9fcf9e4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/locutusjs/locutus/commit/345a6211e1e6f939f96a7090bfeff642c9fcf9e4"
                },
                {
                    "name": "https://github.com/locutusjs/locutus/releases/tag/v3.0.25",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/locutusjs/locutus/releases/tag/v3.0.25"
                }
            ],
            "affected": [
                {
                    "vendor": "locutusjs",
                    "product": "locutus",
                    "versions": [
                        {
                            "version": "< 3.0.25",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-03-27T22:14:03.495Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Locutus brings stdlibs of other programming languages to JavaScript for educational purposes. Prior to version 3.0.25, the `unserialize()` function in `locutus/php/var/unserialize` assigns deserialized keys to plain objects via bracket notation without filtering the `__proto__` key. When a PHP serialized payload contains `__proto__` as an array or object key, JavaScript's `__proto__` setter is invoked, replacing the deserialized object's prototype with attacker-controlled content. This enables property injection, for...in propagation of injected properties, and denial of service via built-in method override. This is distinct from the previously reported prototype pollution in `parse_str` (GHSA-f98m-q3hr-p5wq, GHSA-rxrv-835q-v5mh) — `unserialize` is a different function with no mitigation applied. Version 3.0.25 patches the issue."
                }
            ],
            "source": {
                "advisory": "GHSA-4mph-v827-f877",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-30T15:45:05.433846Z",
                                "id": "CVE-2026-33993",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-03-30T15:45:18.660Z"
                }
            }
        ]
    }
}