toml-node: Prototype Pollution Leads to `Object.prototype` Corruption via `__proto__` Key-Path Desynchronization

Summary toml.parse writes attacker-controlled keys onto Object.prototype. The compiler protects the tables it builds by creating them with Object.createnull, which neutralizes a direct proto table. An attacker bypasses that protection by routing a table path through a scalar value and into the re...

CVE-2026-63376 toml-node: Prototype Pollution Leads to `Object.prototype` Corruption via `__proto__` Key-Path Desynchronization

toml-node is a TOML parser for Node.js and the browser. Prior to 4.1.2, toml.parse in lib/compiler.js can be tricked by a table path such as a.b.y.proto.proto, allowing traversal from a scalar value into Number.prototype and Object.prototype. The currentPath tracking value uses both arrays and...

CVE-2026-63376

toml-node , a TOML parser for Node.js and the browser, is affected by a prototype pollution vulnerability in toml.parse() (lib/compiler.js) prior to version 4.1.2. The root cause is a key-path desynchronization : currentPath tracking uses both arrays and strings, so valueAssignments records a com...

EUVD-2026-70738

toml-node is a TOML parser for Node.js and the browser. Prior to 4.1.2, toml.parse in lib/compiler.js can be tricked by a table path such as a.b.y.proto.proto, allowing traversal from a scalar value into Number.prototype and Object.prototype. The currentPath tracking value uses both arrays and...