What’s Vulnerable › Vulnerabilities

CVE-2026-114142: toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype

• Severity: high (CVSS 8.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-21 · updated 2026-10-28
• Weakness: CWE-1321

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 products

• BinaryMuse toml-node: before 5.0.1

References

• https://github.com/BinaryMuse/toml-node/commit/609c873fffea0a27ebe5b4dd098eed2b3daf3606
• https://github.com/BinaryMuse/toml-node/releases/tag/v5.0.1
• https://github.com/BinaryMuse/toml-node/security/advisories/GHSA-h895-cgqg-jf52

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