Time-of-check Time-of-use (TOCTOU) Race Condition Affecting docling-slim package, versions [,2.132.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-PYTHON-DOCLINGSLIM-20537233
- published6 Oct 2026
- disclosed5 Oct 2026
- creditDavid Carliez, Adel Zaitri
Introduced: 5 Oct 2026
NewCVE-2026-105743 (opens in a new tab)How to fix?
Upgrade docling-slim to version 2.132.0 or higher.
Overview
docling-slim is a Modular version of the Docling package: SDK and CLI for parsing PDF, DOCX, HTML, and more, to a unified document representation for powering downstream workflows such as gen AI applications.
Affected versions of this package are vulnerable to Time-of-check Time-of-use (TOCTOU) Race Condition via the HTML backend's remote fetch logic in html_backend.py and image_resource_loader.py, when remote fetching is enabled. An attacker can supply a document containing URLs that resolve to internal or otherwise restricted network addresses (including IPv4 addresses embedded in IPv6 addresses), causing the backend to issue requests to those addresses without validation. Redirects are followed without per-hop address validation, and configured HTMLBackendOptions.headers (which may carry credentials or tokens) are forwarded to cross-origin destinations reached through redirects.
Note: This is only exploitable when enable_remote_fetch=True is explicitly set, as remote fetching is disabled by default. When a proxy is configured through environment variables, requests go through the proxy, which is then responsible for filtering destinations.