CVE-2026-114142 toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114142?
CVE-2026-114142 is a high-severity vulnerability in BinaryMuse toml-node, published on 21 Oct 2026.
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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-114142?
2 open source packages ship an affected version, including toml.
| Package | Affected | Fixed in |
|---|---|---|
toml npm | All versions | 5.0.1 |
toml npm | All versions | 5.0.1 |
How do I fix CVE-2026-114142?
Upgrade toml to 5.0.1 or later.
Is CVE-2026-114142 being exploited?
There is no known exploitation of CVE-2026-114142 in the wild and no public exploit code.
Sources
Also known as GHSA-h895-cgqg-jf52.