CVE-2026-43979

Medium

Description

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.

SeverityMedium

CVSS5.0

Exploit probability—

ProductLocal-deep-research

PublishedMay 28, 2026

First seenMay 28, 2026

Weakness typeCWE-79Cross-site scripting (XSS)CWE-918Server-side request forgery (SSRF)

How to fix

Update

local-deep-research1.6.0 or later

Affected products

Product	Affected versions	Fixed in
local-deep-researchPyPI	v < 1.6.0	1.6.0

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