{"id":"CVE-2021-48012","aliases":[],"cve":{"records":[{"id":"CVE-2021-48012","source":"VulnCheck","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-10-12T19:37:38.614Z","published":"2026-10-12T20:55:05.966Z","modified":"2026-10-26T17:37:12.265Z"}],"publishers":[{"name":"VulnCheck","role":"CNA","organizationId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","modified":"2026-10-12T20:55:05.966Z"},{"name":"CISA-ADP","role":"ADP","organizationId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","modified":"2026-10-26T17:37:12.265Z"}],"references":[{"url":"https://github.com/Gin-Quin/fast-toml/issues/8","tags":["issue-tracking"],"source":"VulnCheck"},{"url":"https://github.com/Gin-Quin/fast-toml/pull/3","tags":["issue-tracking","patch"],"source":"VulnCheck"},{"url":"https://github.com/Gin-Quin/fast-toml","tags":["product"],"source":"VulnCheck"},{"url":"https://www.vulncheck.com/advisories/fast-toml-through-0.5.4-prototype-pollution-via-proto-keys-in-parsed-toml","tags":["third-party-advisory"],"source":"VulnCheck"}],"weaknesses":[{"id":"CWE-1321","description":"Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","source":"VulnCheck"}],"applicability":[],"prioritization":[{"source":"CISA-ADP","type":"SSVC","role":"CISA Coordinator","timestamp":"2026-10-26T17:29:18.514431Z","decisions":[{"name":"Exploitation","value":"none"},{"name":"Automatable","value":"yes"},{"name":"Technical Impact","value":"partial"}]}]},"title":"fast-toml through 0.5.4 Prototype Pollution via __proto__ Keys in Parsed TOML","titleSource":"VulnCheck","descriptionSource":"VulnCheck","description":"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bypass.","score":8.8,"severity":"high","published":"2026-10-12T20:55:05.966Z","modified":"2026-10-26T17:37:12.265Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Gin-Quin","name":"fast-toml","platforms":[],"versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.5.4","versionType":"semver"}],"defaultStatus":"unaffected","packageURL":"pkg:npm/fast-toml","packageIdentity":{"ecosystem":"npm","name":"fast-toml"},"cpes":[],"source":"VulnCheck","url":"https://www.cve.org/CVERecord?id=CVE-2021-48012"}],"remediation":[],"references":["https://github.com/Gin-Quin/fast-toml/issues/8","https://github.com/Gin-Quin/fast-toml/pull/3","https://github.com/Gin-Quin/fast-toml","https://www.vulncheck.com/advisories/fast-toml-through-0.5.4-prototype-pollution-via-proto-keys-in-parsed-toml"],"sources":[{"name":"CVE","id":"CVE-2021-48012","modified":"2026-10-26T17:37:12.265Z","url":"https://www.cve.org/CVERecord?id=CVE-2021-48012"}],"assessments":[{"source":"VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","score":8.8},{"source":"VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L","score":8.2}],"sourceAffected":[],"observedAt":"2026-10-29T14:05:07.399Z","kev":{"status":"not-listed","checkedAt":"2026-10-31T11:30:32.033Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"fast-toml versions 0.5.4 and below contain a prototype pollution vulnerability, allowing attackers to modify Object.prototype with crafted TOML input, potentially causing denial of service or authorization bypass. Attackers must supply specific key segments to parse().","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T10:00:44.012Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2021-48012"}]}}