Docling's JATS XML backend is vulnerable to XML Entity Expansion (XXE) attacks

High7.5CVE-2026-31247 · Published May 11, 2026 · updated Jul 13, 2026

Docling's JATS XML backend is vulnerable to XML Entity Expansion (XXE) attacks thru 2.61.0. The backend uses etree.parse() to parse XML files without disabling entity resolution. An attacker can craft a malicious XML file containing a nested entity expansion payload (XML Bomb). When processed by Docling, the exponential expansion of entities leads to excessive resource consumption, resulting in a denial of service (DoS) condition on the system running the Docling parser.