{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63376", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-16T17:39:30.170Z", "datePublished": "2026-09-03T20:34:57.129Z", "dateUpdated": "2026-09-03T20:34:57.129Z"}, "containers": {"cna": {"title": "toml-node: Prototype Pollution Leads to `Object.prototype` Corruption via `__proto__` Key-Path Desynchronization", "problemTypes": [{"descriptions": [{"cweId": "CWE-1321", "lang": "en", "description": "CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L", "version": "3.1"}}], "references": [{"name": "https://github.com/BinaryMuse/toml-node/security/advisories/GHSA-v5mp-jgw5-2x6j", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/BinaryMuse/toml-node/security/advisories/GHSA-v5mp-jgw5-2x6j"}, {"name": "https://github.com/BinaryMuse/toml-node/commit/def6ab5ea99038c0dd482cd6af1745a6af8b4c44", "tags": ["x_refsource_MISC"], "url": "https://github.com/BinaryMuse/toml-node/commit/def6ab5ea99038c0dd482cd6af1745a6af8b4c44"}, {"name": "https://github.com/BinaryMuse/toml-node/commit/dfaff662276adc38a2e03df3139f7119b0185463", "tags": ["x_refsource_MISC"], "url": "https://github.com/BinaryMuse/toml-node/commit/dfaff662276adc38a2e03df3139f7119b0185463"}], "affected": [{"vendor": "BinaryMuse", "product": "toml-node", "versions": [{"version": "< 4.1.2", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-03T20:34:57.129Z"}, "descriptions": [{"lang": "en", "value": "toml-node is a TOML parser for Node.js and the browser. Prior to 4.1.2, toml.parse() in lib/compiler.js can be tricked by a table path such as a.b.y.__proto__.__proto__, allowing traversal from a scalar value into Number.prototype and Object.prototype. The currentPath tracking value uses both arrays and strings, so valueAssignments records a comma-joined path such as a,b.y while deepRef checks the dot-joined path a.b.y, allowing the duplicate-key guard to miss and attacker-controlled keys to be written to Object.prototype. A table-array prefix-clearing path in addTableArray can also erase guard state before the same __proto__ traversal. Injected properties become visible throughout the Node.js process and can cause denial of service, logic or authorization bypass, or code execution when an application contains a suitable gadget. This issue is fixed in version 4.1.2."}], "source": {"advisory": "GHSA-v5mp-jgw5-2x6j", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "toml-node", "vendor": "BinaryMuse", "versions": [{"status": "affected", "version": "< 4.1.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "toml-node is a TOML parser for Node.js and the browser. Prior to 4.1.2, toml.parse() in lib/compiler.js can be tricked by a table path such as a.b.y.__proto__.__proto__, allowing traversal from a scalar value into Number.prototype and Object.prototype. The currentPath tracking value uses both arrays and strings, so valueAssignments records a comma-joined path such as a,b.y while deepRef checks the dot-joined path a.b.y, allowing the duplicate-key guard to miss and attacker-controlled keys to be written to Object.prototype. A table-array prefix-clearing path in addTableArray can also erase guard state before the same __proto__ traversal. Injected properties become visible throughout the Node.js process and can cause denial of service, logic or authorization bypass, or code execution when an application contains a suitable gadget. This issue is fixed in version 4.1.2."}], "id": "CVE-2026-63376", "lastModified": "2026-09-03T21:17:21.513", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 8.2, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-09-03T21:17:21.513", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/BinaryMuse/toml-node/commit/def6ab5ea99038c0dd482cd6af1745a6af8b4c44"}, {"source": "security-advisories@github.com", "url": "https://github.com/BinaryMuse/toml-node/commit/dfaff662276adc38a2e03df3139f7119b0185463"}, {"source": "security-advisories@github.com", "url": "https://github.com/BinaryMuse/toml-node/security/advisories/GHSA-v5mp-jgw5-2x6j"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1321"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "toml-node: toml-node: Arbitrary Code Execution via Prototype Pollution in TOML Parsing", "id": "2528256", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2528256"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-915", "details": ["A flaw was found in toml-node, a software library used for parsing TOML (Tom's Obvious, Minimal Language) files in Node.js and web applications. A remote attacker could exploit a vulnerability known as prototype pollution by providing specially crafted TOML input. This could allow the attacker to inject properties into fundamental JavaScript objects, potentially leading to arbitrary code execution, denial of service, or bypassing security controls within the affected application."], "mitigation": {"lang": "en:us", "value": "No mitigation is available for this vulnerability."}, "name": "CVE-2026-63376", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "cockpit-image-builder", "product_name": "Red Hat Enterprise Linux 10"}], "public_date": "2026-09-03T20:34:57Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63376\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63376\nhttps://github.com/BinaryMuse/toml-node/commit/def6ab5ea99038c0dd482cd6af1745a6af8b4c44\nhttps://github.com/BinaryMuse/toml-node/commit/dfaff662276adc38a2e03df3139f7119b0185463\nhttps://github.com/BinaryMuse/toml-node/security/advisories/GHSA-v5mp-jgw5-2x6j"], "statement": "The toml npm package is bundled in cockpit-image-builder, where the vulnerable TOML parser is only invoked client-side when an authenticated user manually uploads a blueprint file. While prototype pollution of Object.prototype is possible via crafted TOML input, exploitation requires an application-specific gadget to escalate beyond the pollution itself. No such gadget has been identified in cockpit-image-builder's React/PatternFly frontend. Red Hat rates this as Low impact.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.1.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "toml-node", "source": "cna", "vendor": "BinaryMuse"}, "product": "toml-node", "vendor": "binarymuse"}], "created": "2026-09-03T22:00:13.786827+00:00", "updated": "2026-09-04T15:22:10.777755+00:00", "vendors": ["binarymuse", "binarymuse$PRODUCT$toml-node"], "weaknesses": ["CWE-1321", "CWE-915"]}