{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2021-48012",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-10-12T19:37:38.614Z",
        "datePublished": "2026-10-12T20:55:05.966Z",
        "dateUpdated": "2026-10-12T20:55:05.966Z"
    },
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                "dateUpdated": "2026-10-12T20:55:05.966Z"
            },
            "datePublic": "2021-01-14T00:00:00.000Z",
            "title": "fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "fast-toml through 0.5.4 contains a prototype pollution vulnerability that allows attackers to modify Object.prototype by supplying TOML containing __proto__, constructor or prototype key segments. Attackers can pass [__proto__] or [constructor.prototype] table headers or __proto__.x dotted keys to parse() to pollute all objects, causing denial of service or authorization bypass."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')",
                            "cweId": "CWE-1321",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "Gin-Quin",
                    "product": "fast-toml",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "0.5.4"
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                    "packageURL": "pkg:npm/fast-toml",
                    "repo": "https://github.com/Gin-Quin/fast-toml"
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "HIGH",
                        "vulnAvailabilityImpact": "LOW",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH"
                    }
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                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "HIGH",
                        "availabilityImpact": "LOW",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://github.com/Gin-Quin/fast-toml/issues/8",
                    "tags": [
                        "issue-tracking"
                    ],
                    "name": "GitHub Issue #8"
                },
                {
                    "url": "https://github.com/Gin-Quin/fast-toml/pull/3",
                    "tags": [
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                        "patch"
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                    "name": "GitHub Pull Request #3"
                },
                {
                    "url": "https://github.com/Gin-Quin/fast-toml",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "name": "VulnCheck Advisory: fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML",
                    "tags": [
                        "third-party-advisory"
                    ],
                    "url": "https://www.vulncheck.com/advisories/fast-toml-through-0.5.4-prototype-pollution-via-proto-keys-in-parsed-toml"
                }
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                {
                    "lang": "en",
                    "value": "Abdulloh Nuriddinov",
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}