sitemap.py applies…¶

Key facts

CVE-2026-72848 is a High (8.6) vulnerability: SitemapLoader.parse_sitemap in langchain_community/document_loaders/sitemap.py applies…. This entry ships a detection-only PoC and a Docker test lab.


CVE	CVE-2026-72848
Severity	High (8.6)
Detection / prevention	—
PoC	poc.py
Source	2026/CVE-2026-72848/

Details¶

English | 한국어

Description¶

SitemapLoader.parse_sitemap in langchain_community/document_loaders/sitemap.py applies the documented restrict_to_same_domain control only to leaf url entries. The loop over url elements filters cross-domain locations, but the loop over nested sitemap elements passes the child loc straight to self.scrape_all([loc.text], "xml"), which reaches WebBaseLoader.scrape_all and an aiohttp GET, with no domain comparison and no check for private, loopback or link-local destinations. An attacker who controls or influences an ingested sitemap can therefore point a nested sitemap entry at an internal address and make the server fetch it even when the deploying application set restrict_to_same_domain to True specifically to confine outbound requests. The fetched content is parsed and surfaces in the returned Documents, so internal responses are disclosed to the caller rather than merely requested.

Vulnerability Details¶

Property	Value
CVE ID	CVE-2026-72848
Type	SSRF
CVSS Score	8.6

Proof of Concept¶

Download¶

# Download PoC script
curl -O https://raw.githubusercontent.com/fankh/vulnerability-poc/main/2026/CVE-2026-72848/poc.py

Usage¶

# Run PoC against target
python3 poc.py --target <TARGET_URL>

# With authentication
python3 poc.py --target <TARGET_URL> --username <USER> --password <PASS>

⚠️ Warning: This PoC is for authorized security testing only. It uses detection-only techniques and does not exploit or damage target systems.

Test Lab¶

This repository includes a Docker-based test environment with both vulnerable and patched applications.

Quick Start¶

# Clone and navigate to CVE directory
cd CVE-2026-72848

# Start both applications
docker-compose up -d

# Run tests
./run-tests.sh    # Linux/Mac
./run-tests.ps1   # Windows PowerShell

Application Endpoints¶

Application	URL	Status
Vulnerable App	http://localhost:8080	Shows vulnerability
Patched App	http://localhost:8081	Demonstrates fix

Directory Structure¶

├── README.md           # English documentation
├── README_KO.md        # Korean documentation
├── poc.py              # PoC detection script
├── docker-compose.yml  # Container orchestration
├── run-tests.sh        # Linux/Mac test runner
├── run-tests.ps1       # Windows test runner
├── vulnerable-app/     # Vulnerable version
│   ├── app.py
│   ├── Dockerfile
│   └── requirements.txt
└── patched-app/        # Fixed version
    ├── app.py
    ├── Dockerfile
    └── requirements.txt

References¶

https://github.com/langchain-ai/langchain-community
https://github.com/langchain-ai/langchain-community/blob/main/libs/community/langchain_community/document_loaders/sitemap.py
https://github.com/langchain-ai/langchain/issues/38814
https://www.vulncheck.com/advisories/langchain-community-sitemaploader-does-not-apply-restrict-to-same-domain-to-nested-sitemap-index-entries-allowing-server-side-request-forgery
https://github.com/langchain-ai/langchain/issues/38814

Generated by PoC Generator on 2026-08-22T11:53:04.478505791

Frequently asked questions¶

What is CVE-2026-72848?¶

CVE-2026-72848 is a High (8.6) vulnerability: SitemapLoader.parse_sitemap in langchain_community/document_loaders/sitemap.py applies…. This entry ships a detection-only PoC and a Docker test lab.

How do I detect CVE-2026-72848?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2026-72848?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.