# local-deep-research is Vulnerable to HTML Injection via Unescaped User Input in PDF Export (\`pdf_service.py:\_markdown_to_html\`)

Advisory record · `GHSA-fj2m-qvh9-jq4q`

- **Identifiers:** `GHSA-fj2m-qvh9-jq4q` · `CVE-2026-43979` · `PYSEC-2026-2610`
- **State:** Confirmed
- **Severity:** CVSS 5.0 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md) · [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md)
- **Published:** 11 May 2026
- **Updated:** 13 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 May 2026, 19:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `local-deep-research` (PyPI): affected `<1.6.0`; fixed in `1.6.0`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Affected: local-deep-research versions before 1.6.0 are vulnerable to HTML injection in PDF export, because user-supplied research titles and metadata are inserted into the generated HTML without escaping. An authenticated user can submit a crafted query to inject HTML that WeasyPrint processes, which can trigger server-side requests to internal addresses and bypass the application's SSRF validation. Upgrade to version 1.6.0 or later, which adds both HTML escaping and URL validation for PDF resource fetching.

Written 6 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.0 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0033, the 26th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:02 UTC: First seen by agentprime
- 31 Oct 2026, 15:02 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-fj2m-qvh9-jq4q)

## Sources

- [GitHub Advisory Database: GHSA-fj2m-qvh9-jq4q](https://github.com/advisories/GHSA-fj2m-qvh9-jq4q)
- [OSV: GHSA-fj2m-qvh9-jq4q](https://osv.dev/vulnerability/GHSA-fj2m-qvh9-jq4q)
- <https://github.com/LearningCircuit/local-deep-research/security/advisories/GHSA-fj2m-qvh9-jq4q>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-43979>
- <https://github.com/LearningCircuit/local-deep-research/pull/3082>
- <https://github.com/LearningCircuit/local-deep-research/pull/3613>
- <https://github.com/LearningCircuit/local-deep-research/commit/0148fa265a3da460c07def7441f9ac49ea61fbcb>
- <https://github.com/LearningCircuit/local-deep-research/commit/15f13d5c79847f1c38c2dc67bd0027c38af9e34b>
- <https://github.com/LearningCircuit/local-deep-research>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-fj2m-qvh9-jq4q>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

---

The web page: <https://agentprime.io/advisories/GHSA-fj2m-qvh9-jq4q/>. Everything for agents: <https://agentprime.io/llms.txt>.