Docling: Unsafe XML Entity Expansion in USPTO Patent Backend

高 7.5CVE-2026-44020 · GHSA-m88r-rg27-5xfg · PYSEC-2026-240 · 24/06/2026 公開 · 25/10/2026 更新

要点

CVE-2026-44020 は docling, docling (docling) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
今後30日間に悪用される確率（EPSS）：0.60%（全脆弱性の 48.8% より高い）。
対処：2.74.0 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
docling PyPI	`≥ 2.13.0, < 2.74.0`	`2.74.0`
docling docling	`≥ 2.13.0, < 2.74.0`	`2.74.0`

概要

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

NVD の説明

Docling simplifies document processing by parsing diverse formats and providing integrations with the generative AI ecosystem. From 2.13.0 until 2.74.0, 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, or 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. This vulnerability is fixed in 2.74.0.