CVE-2026-105743 Docling has SSRF guard bypass in remote resource fetching (DNS rebinding / multi-record resolution; no IP validation in HTML render mode)
Attackers can bypass SSRF protections via DNS rebinding to access internal services when remote fetching is enabled in Docling.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-105743?
CVE-2026-105743 is a medium-severity server-side request forgery vulnerability in docling-project docling, published on 5 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-105743?
6 open source packages ship an affected version, including docling and docling-slim. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
docling PyPI | From 2.91.0 | 2.132.0 |
docling PyPI | From 2.91.0 | 2.132.0 |
docling PyPI | From 2.91.0 | 2.132.0 |
docling-slim PyPI | From 2.92.0 | 2.132.0 |
docling-slim PyPI | From 2.92.0 | 2.132.0 |
docling-slim PyPI | From 2.92.0 | 2.132.0 |
Products include Docling Docling.
How do I fix CVE-2026-105743?
Upgrade docling to 2.132.0 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-105743 being exploited?
There is no known exploitation of CVE-2026-105743 in the wild and no public exploit code.
Other vulnerabilities in docling-project docling
- CVE-2026-44016 Docling: Unsafe Playwright-based HTML Rendering
- CVE-2026-105744 Docling has arbitrary file read/write (and command execution when shell-escape is enabled) when rendering untrusted TikZ with the opt-in Tectonic engine
- CVE-2026-44017 Docling: Unsafe Zip Extraction in EasyOCR Model Download
- CVE-2026-44020 Docling: Unsafe XML Entity Expansion in USPTO Patent Backend
- CVE-2026-47214 Docling: Unsafe URI and Path Handling in HTML Backend
Sources
Also known as GHSA-pc36-qwjq-x68c, PYSEC-2026-4190, PYSEC-2026-4214.