{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55451",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-16T21:59:57.018Z",
        "datePublished": "2026-09-14T16:49:36.238Z",
        "dateUpdated": "2026-09-14T18:53:39.960Z"
    },
    "containers": {
        "cna": {
            "title": "gettext-converter: Prototype pollution in js2i18next() via crafted translation keys",
            "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": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.3,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/locize/gettext-converter/security/advisories/GHSA-f4jp-rw7w-ccwg"
                },
                {
                    "name": "https://github.com/locize/gettext-converter/issues/15",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/locize/gettext-converter/issues/15"
                },
                {
                    "name": "https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/locize/gettext-converter/commit/df90c3b93e51faef68891d97b626544f619c5b31"
                },
                {
                    "name": "https://github.com/locize/gettext-converter/releases/tag/v1.3.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/locize/gettext-converter/releases/tag/v1.3.3"
                }
            ],
            "affected": [
                {
                    "vendor": "locize",
                    "product": "gettext-converter",
                    "versions": [
                        {
                            "version": "< 1.3.3",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-14T16:49:36.238Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "gettext-converter provides gettext resource conversion utilities for JavaScript. Prior to 1.3.3, js2i18next() in lib/js2i18next.js splits nested translation keys using options.keyseparator, whose default value consists of two number signs, and uses each segment as a dynamic object key without rejecting __proto__, constructor, or prototype. When an application converts untrusted PO or i18next translation data, a __proto__ segment resolves Object.prototype as the nested write target and Object.assign writes attacker-controlled translated properties onto the process-wide prototype. The resulting prototype pollution can cause denial of service and may enable application-dependent follow-on attacks. This issue is fixed in version 1.3.3."
                }
            ],
            "source": {
                "advisory": "GHSA-f4jp-rw7w-ccwg",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/locize/gettext-converter/issues/15",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-14T18:53:33.771788Z",
                                "id": "CVE-2026-55451",
                                "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": "2026-09-14T18:53:39.960Z"
                }
            }
        ]
    }
}