CVE-2025-55195 HIGH

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

Vendor Denoland
Product std
Weakness CWE-1321
Published August 14, 2025
Last update August 14, 2025

CVSS base score

7.3/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

What the vulnerability does

01Description

@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.

Key dates

02Disclosure timeline

August 14, 2025 CVE published
August 14, 2025 Record updated