CVE-2026-114142

toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype

Published Oct 21, 2026 CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Description
toml-node is a TOML parser for Node.js and the browser. Prior to 5.0.1, toml.parse() can write attacker-controlled properties to Object.prototype because quoteDottedString() in lib/compiler.js produces the same bookkeeping string for distinct quoted key paths, allowing addTableArray() to clear another key's guard. The assign() path then descends through an unowned Date value without applying the owned-container check and can reach the prototype chain. Objects created elsewhere in the process can inherit the injected property. This issue is fixed in version 5.0.1.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-h895-cgqg-jf52 toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Binarymuse
Binarymuse toml-node
Vendors & Products Binarymuse
Binarymuse toml-node
Type Values Removed Values Added
Description toml-node is a TOML parser for Node.js and the browser. Prior to 5.0.1, toml.parse() can write attacker-controlled properties to Object.prototype because quoteDottedString() in lib/compiler.js produces the same bookkeeping string for distinct quoted key paths, allowing addTableArray() to clear another key's guard. The assign() path then descends through an unowned Date value without applying the owned-container check and can reach the prototype chain. Objects created elsewhere in the process can inherit the injected property. This issue is fixed in version 5.0.1.
Title toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype
Weaknesses CWE-1321
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Oct 28, 2026, 6:19 PM
Reserved
Oct 20, 2026, 9:53 PM
Status
Deferred
Published
Oct 21, 2026, 9:17 PM
Modified
Oct 28, 2026, 7:17 PM