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EUVD-2026-322632

fkie_cve-2026-43979

Local Deep Research is an AI-powered research assistant for deep, iterative research. Prior to 1.6.0, PDFService._markdown_to_html() constructs an HTML document by interpolating user-controlled values — specifically title (sourced from research.title or research.query) and metadata key-value pairs — directly into an f-string without any HTML escaping. An authenticated attacker can craft a research query containing HTML special characters to inject arbitrary HTML tags into the document processed by WeasyPrint during PDF export. This injection can be chained to trigger a Server-Side Request Forgery (SSRF), bypassing the application's existing SSRF defenses in ssrf_validator.py. This vulnerability is fixed in 1.6.0.

GHSA-fj2m-qvh9-jq4q — local-deep-research is Vulnerable to HTML Injection via Unescaped User Input in PDF Export (`pdf_service.py:_markdown_t…

Affected: PyPI: local-deep-research

## Summary

`PDFService._markdown_to_html()` constructs an HTML document by interpolating user-controlled values — specifically `title` (sourced from `research.title` or `research.query`) and `metadata` key-value pairs — directly into an f-string without any HTML escaping. An authenticated attacker can craft a research query containing HTML special characters to inject arbitrary HTML tags into the document processed by WeasyPrint during PDF export. This injection can be chained to trigger a Server-Side Request Forgery (SSRF), bypassing the application's existing SSRF defenses in `ssrf_validator.py`.

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## Details

**Vulnerable code:** `src/local_deep_research/web/services/pdf_service.py`, lines 171–176

```python # pdf_service.py:171-176 if title: html_parts.append(f"<title>{title}</title>") # ← title is not escaped

if metadata: for key, value in metadata.items(): html_parts.append(f'<meta name="{key}" content="{value}">') # ← key/value are not escaped ```

**Data flow trace:**

``` User input: research.query │ ▼ research_routes.py:1321 pdf_title = research.title or research.query │ ▼ research_routes.py:1325-1326 export_report_to_memory(report_content, format, title=pdf_title) │ ▼ pdf_service.py:107 PDFService.markdown_to_pdf(markdown_content, title=pdf_title) │ ▼ pdf_service.py:137 _markdown_to_html(markdown_content, title, metadata) │ ▼ pdf_service.py:172 f"<tit…

PYSEC-2026-2610 — local-deep-research is Vulnerable to HTML Injection via Unescaped User Input in PDF Export (`pdf_service.py:_markdown_t…