- CVSS
- HIGH · 8.6v3.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
- Published
- 2026-08-20
- Weakness
- CWE-918
- Source
- nvd.nist.gov/vuln/detail/CVE-2026-72848
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.
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
How GTK Cyber trains on this
AI security training at GTK Cyber covers the LLM and ML-pipeline vulnerability classes that vulnerabilities like CVE-2026-72848 fall into. Our hands-on courses are taught by Charles Givre and other practitioners who break and defend production AI systems.