id: PYSEC-2026-2454
published: "2026-07-13T15:15:45.363503Z"
modified: "2026-07-13T16:03:56.038082Z"
aliases:
- CVE-2026-31248
- GHSA-9f4q-q82q-4359
summary: Docling's METS GBS backend is vulnerable to XML Entity Expansion (XXE) attacks
details: 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.
affected:
- package:
    name: docling
    ecosystem: PyPI
    purl: pkg:pypi/docling
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - last_affected: 2.61.0
  versions:
  - 0.1.0
  - 0.1.1
  - 0.1.2
  - 0.2.0
  - 0.3.0
  - 0.3.1
  - 0.4.0
  - 1.0.0
  - 1.0.1
  - 1.0.2
  - 1.1.0
  - 1.1.1
  - 1.1.2
  - 1.10.0
  - 1.11.0
  - 1.12.0
  - 1.12.1
  - 1.12.2
  - 1.13.0
  - 1.13.1
  - 1.14.0
  - 1.15.0
  - 1.16.0
  - 1.16.1
  - 1.17.0
  - 1.18.0
  - 1.19.0
  - 1.19.1
  - 1.2.0
  - 1.2.1
  - 1.20.0
  - 1.3.0
  - 1.4.0
  - 1.5.0
  - 1.6.0
  - 1.6.1
  - 1.6.2
  - 1.6.3
  - 1.7.0
  - 1.7.1
  - 1.8.0
  - 1.8.1
  - 1.8.2
  - 1.8.3
  - 1.8.4
  - 1.8.5
  - 1.9.0
  - 2.0.0
  - 2.1.0
  - 2.10.0
  - 2.11.0
  - 2.12.0
  - 2.13.0
  - 2.14.0
  - 2.15.0
  - 2.15.1
  - 2.16.0
  - 2.17.0
  - 2.18.0
  - 2.19.0
  - 2.2.0
  - 2.2.1
  - 2.20.0
  - 2.21.0
  - 2.22.0
  - 2.23.0
  - 2.23.1
  - 2.24.0
  - 2.25.0
  - 2.25.1
  - 2.25.2
  - 2.26.0
  - 2.27.0
  - 2.28.0
  - 2.28.1
  - 2.28.2
  - 2.28.3
  - 2.28.4
  - 2.29.0
  - 2.3.0
  - 2.3.1
  - 2.30.0
  - 2.31.0
  - 2.31.1
  - 2.31.2
  - 2.32.0
  - 2.33.0
  - 2.34.0
  - 2.35.0
  - 2.36.0
  - 2.36.1
  - 2.37.0
  - 2.38.0
  - 2.38.1
  - 2.39.0
  - 2.4.0
  - 2.4.1
  - 2.4.2
  - 2.40.0
  - 2.41.0
  - 2.42.0
  - 2.42.1
  - 2.42.2
  - 2.43.0
  - 2.44.0
  - 2.45.0
  - 2.46.0
  - 2.47.0
  - 2.47.1
  - 2.48.0
  - 2.49.0
  - 2.5.0
  - 2.5.1
  - 2.5.2
  - 2.50.0
  - 2.51.0
  - 2.52.0
  - 2.53.0
  - 2.54.0
  - 2.55.0
  - 2.55.1
  - 2.56.0
  - 2.56.1
  - 2.57.0
  - 2.58.0
  - 2.59.0
  - 2.6.0
  - 2.60.0
  - 2.60.1
  - 2.61.0
  - 2.7.0
  - 2.7.1
  - 2.8.0
  - 2.8.1
  - 2.8.2
  - 2.8.3
  - 2.9.0
references:
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-31248
- type: PACKAGE
  url: https://github.com/docling-project/docling
- type: WEB
  url: https://www.notion.so/CVE-2026-31248-35d1e1393188818585b2ce3b9ce24686
- type: PACKAGE
  url: https://pypi.org/project/docling
- type: ADVISORY
  url: https://github.com/advisories/GHSA-9f4q-q82q-4359
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H