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

CAO 7.5CVE-2023-34104 · GHSA-6w63-h3fj-q4vw · Công bố 06/06/2023 · cập nhật 17/06/2026

Tóm tắt nhanh

CVE-2023-34104 là lỗ hổng mức CAO (CVSS 7.5) ảnh hưởng fast-xml-parser (naturalintelligence), fast-xml-parser.
Xác suất bị khai thác trong 30 ngày tới (EPSS): 1.1%, cao hơn 66.3% các lỗ hổng khác.
Cách xử lý: cập nhật lên 4.2.4 hoặc mới hơn.

Gói / sản phẩm	Phiên bản bị ảnh hưởng	Phiên bản đã vá
fast-xml-parser naturalintelligence	`< 4.2.4`	`4.2.4`
fast-xml-parser npm	`≥ 4.1.3, < 4.2.4`	`4.2.4`

Mô tả

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.

Mô tả của NVD

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.