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CVE-2026-43979— Local Deep Research: HTML Injection via Unescaped User Input in PDF Export (`pdf_service.py:_markdown_to_html`)

Quick assessment

Affected
LearningCircuit local-deep-research
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Local Deep Research是LearningCircuit开源的一个AI搜索助手。 Local Deep Research 1.6.0之前版本存在安全漏洞，该漏洞源于PDFService._markdown_to_html()未对用户控制的值进行HTML转义，可能导致认证攻击者注入任意HTML标签并触发服务端请求伪造。

CVSS 5.0 · Medium EPSS 0.26% · P18

Affected Version Matrix 1

VendorProduct Version RangeStatus
LearningCircuit local-deep-research < 1.6.0 affected
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I. Basic Information for CVE-2026-43979

Vulnerability Information
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Vulnerability Title
Local Deep Research: HTML Injection via Unescaped User Input in PDF Export (`pdf_service.py:_markdown_to_html`)
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Local Deep Research 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Local Deep Research是LearningCircuit开源的一个AI搜索助手。 Local Deep Research 1.6.0之前版本存在安全漏洞，该漏洞源于PDFService._markdown_to_html()未对用户控制的值进行HTML转义，可能导致认证攻击者注入任意HTML标签并触发服务端请求伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
LearningCircuit local-deep-research < 1.6.0 -

II. Public POCs for CVE-2026-43979

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III. Intelligence Information for CVE-2026-43979

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Patches & Fixes for CVE-2026-43979 (2)

Vendor Advisories for CVE-2026-43979 (1)

IV. Related Vulnerabilities

Same product: local-deep-research
Same vendor: LearningCircuit
Same weakness: CWE-79

V. Comments for CVE-2026-43979

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