CVE-2026-31248
HighCVSS 7.5Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
Docling's METS GBS backend is vulnerable to XML Entity Expansion (XXE) attacks through version 2.61.0. An attacker can craft a malicious XML file with nested entity definitions, leading to excessive resource consumption during processing by the Docling parser.
Risk Assessment
This vulnerability can lead to a denial of service (DoS) condition on the system running the Docling parser, potentially affecting service availability for users.
Recommendation
It is recommended to update the METS GBS backend to the latest version that disables entity resolution during XML file processing.
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Original NVD description (English source)
Docling's METS GBS backend is vulnerable to XML Entity Expansion (XXE) attacks thru 2.61.0. The backend extracts and validates XML files from .tar.gz archives using etree.fromstring() without disabling entity resolution. An attacker can craft a malicious XML file with nested entity definitions (XML Bomb) and package it into a .tar.gz archive. When processed by Docling, the exponential expansion of entities during XML parsing leads to excessive resource consumption, resulting in a denial of service (DoS) condition on the system running the Docling parser.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS