CVE-2026-43979: Learningcircuit Local-Deep-Research

Medium severity, CVSS 5.0. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Learningcircuit Local-Deep-Research: before 1.6.0 (fixed in 1.6.0)

Published 2026-05-28. Last modified 2026-06-17.