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Vulnerability · Published Oct 5, 2026 · Assigned by GitHub_M

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

Medium 4.0

In plain English

A medium-severity server-side request forgery in docling from docling-project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.0Medium
Exploit odds (30 days)0.2%top 89.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIdocling2.132.0GHSA-pc36-qwjq-x68c
PyPIdocling2.132.0PYSEC-2026-4190
PyPIdocling-slim2.132.0GHSA-pc36-qwjq-x68c
PyPIdocling-slim2.132.0PYSEC-2026-4214

Affected products (as reported)

VendorProductVersions
docling-project docling >= 2.91.0, < 2.132.0
docling-project docling-slim >= 2.91.0, < 2.132.0

Weakness: CWE-367, CWE-918 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N

References