CVE-2023-26920 – fast-xml-parser

Package

Manager: npm
Name: fast-xml-parser
Vulnerable Version: >=0 <4.1.2

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

EPSS: 0.00226 pctl0.45224

Details

fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name ### Impact As a part of this vulnerability, user was able to se code using `__proto__` as a tag or attribute name. ```js const { XMLParser, XMLBuilder, XMLValidator} = require("fast-xml-parser"); let XMLdata = "<__proto__><polluted>hacked</polluted></__proto__>" const parser = new XMLParser(); let jObj = parser.parse(XMLdata); console.log(jObj.polluted) // should return hacked ``` ### Patches The problem has been patched in v4.1.2 ### Workarounds User can check for "__proto__" in the XML string before parsing it to the parser. ### References https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7

Metadata

Created: 2023-06-13T12:44:34Z
Modified: 2023-12-14T22:27:59Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/06/GHSA-x3cc-x39p-42qx/GHSA-x3cc-x39p-42qx.json
CWE IDs: ["CWE-1321"]
Alternative ID: GHSA-x3cc-x39p-42qx
Finding: F390
Auto approve: 1