CVE-2023-34104
Description
fast-xml-parser is an open source, pure javascript xml parser. 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 denial of service (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. This problem has been resolved in v4.2.4. Users are advised to upgrade. Users unable to upgrade should avoid using DOCTYPE parsing by setting the `processEntities: false` option.
How to fix
- naturalintelligence fast-xml-parser4.2.4 or later
- fast-xml-parser4.2.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| naturalintelligence fast-xml-parser | v < 4.2.4 | 4.2.4 |
| fast-xml-parsernpm | 4.1.3 ≤ v < 4.2.4 | 4.2.4 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.