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

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.

toml-node 是一个面向 Node.js 和浏览器的 TOML 解析器。在 5.0.1 版本之前， 函数允许将攻击者控制的属性写入 。其根本原因在于 中的 函数为不同的带引号键路径生成了相同的记账字符串，导致 错误地清除了其他键的保护机制。随后， 路径在未执行“所属容器检查”的情况下，通过一个非所属的 对象向下遍历，从而触及原型链。进程中其他位置创建的对象可能继承被注入的属性。该问题已在 5.0.1 版本中修复。

CVSS 8.8 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-114142

Vulnerability Information
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Vulnerability Title
toml-node: Prototype pollution: parsing a TOML document can write to Object.prototype
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
BinaryMuse toml-node < 5.0.1 -

II. Public POCs for CVE-2026-114142

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III. Intelligence Information for CVE-2026-114142

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Vendor Advisories for CVE-2026-114142 (1)

Vendor Pages for CVE-2026-114142 (1)

Same Patch Batch · BinaryMuse · 2026-10-21 · 4 CVEs total

CVE-2026-114143 8.7 HIGH toml-node: Quadratic-complexity DoS via long dotted keys or table paths in toml.parse()
CVE-2026-114141 8.7 HIGH toml-node: Quadratic-complexity DoS via many array-of-tables headers in toml.parse()
CVE-2026-114144 7.5 HIGH toml-node: Uncontrolled resource consumption (CPU DoS) via unbounded-length integer litera

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-114142

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