medium6.5
CVE-2023-26920
fast-xml-parser vulnerable to Prototype Pollution through tag or attribute name
Impact
### 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | fast-xml-parser | < 4.1.2 | 4.1.2 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Naturalintelligence | Fast Xml Parser | before 4.1.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://gist.github.com/Sudistark/a5a45bd0804d522a1392cb5023aa7ef7
- https://github.com/NaturalIntelligence/fast-xml-parser/commit/2b032a4f799c63d83991e4f992f1c68e4dd05804
- https://github.com/advisories/GHSA-793h-6f7r-6qvm
- https://github.com/advisories/GHSA-x3cc-x39p-42qx
- https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-x3cc-x39p-42qx
- https://nvd.nist.gov/vuln/detail/CVE-2023-26920