CVE-2026-44020
Docling: Unsafe XML Entity Expansion in USPTO Patent Backend
描述
### Impact The USPTO patent XML parser used the standard `xml.sax.parseString()` without protection against XML External Entity (XXE) attacks. An attacker could craft malicious USPTO patent XML files with external entity references that could: - Read arbitrary files from the server filesystem - Perform Server-Side Request Forgery (SSRF) attacks - Cause denial of service through entity expansion (Billion Laughs attack) The vulnerability affects three USPTO patent format parsers: ICE (v4.x), Grant v2.5, and Application v1.x. ### Patches Fixed in version 2.74.0. The parser now uses `defusedxml.sax.make_parser()` with secure configuration that blocks external entity resolution (`feature_external_ges=False`, `feature_external_pes=False`) while allowing DTD declarations required by USPTO files. This prevents XXE attacks while maintaining compatibility with the USPTO XML format. ### Workarounds Avoid processing USPTO patent XML files from untrusted sources. Implement resource limits (memory, CPU time) when processing patent documents. ### References - Fix release: [v2.74.0](https://github.com/docling-project/docling/releases/tag/v2.74.0)
如何修補 CVE-2026-44020
要修補 CVE-2026-44020,請將受影響套件升級到下列已修補版本。
- —升級至 2.74.0 或更新版本
CVE-2026-44020 正在被利用嗎?
目前沒有被利用訊號。CVE-2026-44020 既不在 CISA KEV 也沒有最新的 EPSS 分數。
受影響套件(1)
- >= 2.13.0, < 2.74.0
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |