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GHSA-6w63-h3fj-q4vw

fast-xml-parser vulnerable to Regex Injection via Doctype Entities

Source: GitHub Advisory Database (reviewed) High CVE-2023-34104

Packages

EcosystemPackageAffectedFixed in
npm fast-xml-parser >= 4.1.3, < 4.2.4 4.2.4

Details

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

### Impact "fast-xml-parser" allows special characters in entity names, which are not escaped or sanitized. Since the entity name is used for creating a regex for searching and replacing entities in the XML body, an attacker can abuse it for DoS attacks. By crafting an entity name that results in an intentionally bad performing regex and utilizing it in the entity replacement step of the parser, this can cause the parser to stall for an indefinite amount of time. ### Patches The problem has been resolved in v4.2.4 ### Workarounds Avoid using DOCTYPE parsing by `processEntities: false` option.

References

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