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CVE-2025-55195— @std/toml Prototype Pollution in Node.js and Browser

Quick assessment

Affected
denoland std
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.

Deno Standard Library（std）是Deno开源的一个 Deno 标准库。 Deno Standard Library 1.0.9之前版本存在安全漏洞，该漏洞源于解析不受信任的TOML数据时可能导致原型污染。

CVSS 7.3 · High EPSS 0.33% · P24

Possible ATT&CK Techniques 1 AI

T1195.002 · Compromise Software Supply Chain
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I. Basic Information for CVE-2025-55195

Vulnerability Information
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Vulnerability Title
@std/toml Prototype Pollution in Node.js and Browser
Source: CVE Program / CVE List V5
Vulnerability Description
@std/toml is the Deno Standard Library. Prior to version 1.0.9, an attacker can pollute the prototype chain in Node.js runtime and Browser when parsing untrusted TOML data, thus achieving Prototype Pollution (PP) vulnerability. This is because the library is merging an untrusted object with an empty object, which by default the empty object has the prototype chain. This issue has been patched in version 1.0.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
Deno Standard Library 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Deno Standard Library（std）是Deno开源的一个 Deno 标准库。 Deno Standard Library 1.0.9之前版本存在安全漏洞，该漏洞源于解析不受信任的TOML数据时可能导致原型污染。
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
denoland std < 1.0.9 -

II. Public POCs for CVE-2025-55195

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III. Intelligence Information for CVE-2025-55195

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Patches & Fixes for CVE-2025-55195 (1)

IV. Related Vulnerabilities

Same product: std
Same vendor: denoland
Same weakness: CWE-1321

V. Comments for CVE-2025-55195

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