BinaryMuse toml-node up to 5.0.0 TOML Parser lib/compiler.js quoteDottedString prototype pollution

Summaryinfo

A vulnerability marked as critical has been reported in BinaryMuse toml-node up to 5.0.0. Affected is the function quoteDottedString of the file lib/compiler.js of the component TOML Parser. Performing a manipulation results in prototype pollution. This vulnerability is known as CVE-2026-114142. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in BinaryMuse toml-node up to 5.0.0. It has been classified as critical. This affects the function quoteDottedString of the file lib/compiler.js of the component TOML Parser. The manipulation with an unknown input leads to a prototype pollution vulnerability. CWE is classifying the issue as CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-114142 since 10/20/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 5.0.1 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• BinaryMuse

Name

• toml-node

Version

• 5.0

Website

• Product: https://github.com/BinaryMuse/toml-node/

CPE 2.3info

• 🔒

CPE 2.2info

• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion