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fkie_cve-2026-105744

Docling simplifies document processing by parsing diverse formats and providing integrations with the generative AI ecosystem. From 2.94.0 until 2.132.0, callers that opt into LatexBackendOptions(tikz_engine="tectonic") invoke docling/backend/latex/engines/tectonic.py to compile an untrusted TikZ body and document preamble without restricting TeX file primitives including \openin and \openout. Crafted input can read files available to the converter and create or overwrite writable files, and enabling the tikz_engine_allow_shell_escape option additionally permits shell commands through TeX. The default configuration, which does not enable Tectonic rendering, is not affected. This vulnerability is fixed in 2.132.0.

GHSA-x3q2-h9hx-4r4j — Docling has arbitrary file read/write (and command execution when shell-escape is enabled) when rendering untrusted Tik…

Affected: PyPI: docling, PyPI: docling-slim

### Summary

When the LaTeX backend is configured to render TikZ pictures with the Tectonic engine (`LatexBackendOptions(tikz_engine="tectonic")`), the TikZ body and the document preamble from the input file are compiled by Tectonic without any restriction on TeX's file primitives. A crafted `.tex` file can read files the process can read and write files at paths the process can write. If the caller also sets `tikz_engine_allow_shell_escape=True`, the document can run shell commands through `\write18`.

### Details

`docling/backend/latex/engines/tectonic.py` writes the picture source into a temporary document and runs the `tectonic` binary on it. `_resolve_local_dependency` only decides which files are staged into the temporary directory. It does not limit what TeX opens at compile time, so:

- `\input{/abs/path}`, `\verbatiminput{...}` and `\openin` read arbitrary files, and their content can be typeset into the rendered picture that ends up in the conversion output. For an in-memory `DocumentStream`, staging is skipped entirely. - `\immediate\openout` / `\write` create or overwrite files outside the temporary directory. Neither needs shell escape. Tectonic's `--untrusted` flag does not block them either.

Separately, the `TectonicEngine` constructor defaults to `allow_shell_escape=True`. The LaTeX backend always passes `tikz_engine_allow_shell_escape` explicitly (default `False`), so this default only affects code that instantiates `TectonicEngine` directly.

### Affected…

PYSEC-2026-4191

Affected: PyPI: docling