Vulnerability · Published Oct 21, 2026 · Assigned by GitHub_M
CVE-2026-114142toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype
High 8.8
In plain English
A high-severity prototype pollution in toml-node from BinaryMuse. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 44% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | toml | 5.0.1 | GHSA-h895-cgqg-jf52 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| BinaryMuse | toml-node | < 5.0.1 |
Weakness: CWE-1321 · 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