{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-50029",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-02T22:46:02.580Z",
        "datePublished": "2026-08-14T19:08:54.941Z",
        "dateUpdated": "2026-08-14T19:08:54.941Z"
    },
    "containers": {
        "cna": {
            "title": "js-toml has silent type confusion via falsy-primitive duplicate-key bypass",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-697",
                            "lang": "en",
                            "description": "CWE-697: Incorrect Comparison",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "LOW",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-m34p-749j-x6m6",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/sunnyadn/js-toml/security/advisories/GHSA-m34p-749j-x6m6"
                },
                {
                    "name": "https://github.com/sunnyadn/js-toml/commit/e0504fa5d3dcde2d1d588c9001c24b7b700beeeb",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/sunnyadn/js-toml/commit/e0504fa5d3dcde2d1d588c9001c24b7b700beeeb"
                },
                {
                    "name": "https://github.com/sunnyadn/js-toml/releases/tag/v1.1.2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/sunnyadn/js-toml/releases/tag/v1.1.2"
                }
            ],
            "affected": [
                {
                    "vendor": "sunnyadn",
                    "product": "js-toml",
                    "versions": [
                        {
                            "version": "< 1.1.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-14T19:08:54.941Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "js-toml is a TOML parser for JavaScript, Prior to version 1.1.2, the interpreter checks whether a key already exists in a parser-built container with `if (object[key])` instead of `if (key in object)`. When the prior value is a falsy primitive — `false`, `0`, `0n`, `0.0`, `-0`, or `\"\"` — the duplicate-key branch is skipped and the value is silently overwritten by a later sub-table, dotted-key sub-table, or array-of-tables sharing the same name. Per the TOML 1.0.0 spec (\"Defining a key multiple times is invalid\"; \"You cannot define any key or table more than once\"), this should be a parse error. The result is structural type confusion of attacker-named keys in the value returned by `load()`. A boolean-typed `false` (or numeric `0`) becomes a truthy object. Host applications that gate behavior on `if (config.flag)`, `if (!user.banned)`, `if (config.allowDelete)`, or `if (config.publicMode)` will silently take the truthy branch. This is distinct from GHSA-65fc-cr5f-v7r2 (the 1.0.2 prototype-pollution fix). `Object.prototype` is not polluted. The `Object.create(null)` mitigation from 1.0.2 is intact; the bug here is in the duplicate-key state machine, not in container construction. Version 1.1.2 patches the incorrect comparison."
                }
            ],
            "source": {
                "advisory": "GHSA-m34p-749j-x6m6",
                "discovery": "UNKNOWN"
            }
        }
    }
}