~ / search / GHSA-x3cc-x39p-42qx

GHSA-x3cc-x39p-42qx

fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name

Source: GitHub Advisory Database (reviewed) Moderate CVE-2023-26920

Packages

EcosystemPackageAffectedFixed in
npm fast-xml-parser < 4.1.2 4.1.2

Details

As written in the advisory (Markdown source, shown as plain text).

### 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

References

External links from the advisory. They lead to third-party sites.