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

Quick assessment

Affected
BinaryMuse toml-node
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Michelle Tilley TOML Parser for Node.js是Michelle Tilley个人开发者的一款TOML格式解析器。 Michelle Tilley TOML Parser for Node.js 4.1.2之前版本存在输入验证错误漏洞，该漏洞源于lib/compiler.js中的toml.parse()函数对类似a.b.y.__proto__.__proto__的表路径跟踪和重复键检查处理不当，可导致攻击者控制的属性写入Number.prototype和Object.pro

CVSS 8.2 · High EPSS 0.38% · P31

Affected Version Matrix 1

VendorProduct Version RangeStatus
BinaryMuse toml-node < 4.1.2 affected
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I. Basic Information for CVE-2026-63376

Vulnerability Information
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Vulnerability Title
toml-node: Prototype Pollution Leads to `Object.prototype` Corruption via `__proto__` Key-Path Desynchronization
Source: CVE Program / CVE List V5
Vulnerability Description
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 strings, so valueAssignments records a comma-joined path such as a,b.y while deepRef checks the dot-joined path a.b.y, allowing the duplicate-key guard to miss and attacker-controlled keys to be written to Object.prototype. A table-array prefix-clearing path in addTableArray can also erase guard state before the same __proto__ traversal. Injected properties become visible throughout the Node.js process and can cause denial of service, logic or authorization bypass, or code execution when an application contains a suitable gadget. This issue is fixed in version 4.1.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Michelle Tilley TOML Parser for Node.js 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Michelle Tilley TOML Parser for Node.js是Michelle Tilley个人开发者的一款TOML格式解析器。 Michelle Tilley TOML Parser for Node.js 4.1.2之前版本存在输入验证错误漏洞，该漏洞源于lib/compiler.js中的toml.parse()函数对类似a.b.y.__proto__.__proto__的表路径跟踪和重复键检查处理不当，可导致攻击者控制的属性写入Number.prototype和Object.pro
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
BinaryMuse toml-node < 4.1.2 -

II. Public POCs for CVE-2026-63376

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III. Intelligence Information for CVE-2026-63376

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Patches & Fixes for CVE-2026-63376 (2)

Vendor Advisories for CVE-2026-63376 (1)

IV. Related Vulnerabilities

Same product: toml-node
Same vendor: BinaryMuse
Same weakness: CWE-1321

V. Comments for CVE-2026-63376

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