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RewindexCVEsLangChain (LangSmith)

CVE-2026-41481: LangChain: HTMLHeaderTextSplitter.split_text_from_url SSRF Redirect Bypass

Medium · CVSS 6.5 (CVSS 3.1)EPSS 0.26%, 18th percentilePublished Updated Assigner: GitHub_M

Description

LangChain is a framework for building agents and LLM-powered applications. Prior to langchain-text-splitters 1.1.2, HTMLHeaderTextSplitter.split_text_from_url() validated the initial URL using validate_safe_url() but then performed the fetch with requests.get() with redirects enabled (the default). Because redirect targets were not revalidated, a URL pointing to an attacker-controlled server could redirect to internal, localhost, or cloud metadata endpoints, bypassing SSRF protections. The response body is parsed and returned as Document objects to the calling application code. Whether this constitutes a data exfiltration path depends on the application: if it exposes Document contents (or derivatives) back to the requester who supplied the URL, sensitive data from internal endpoints could be leaked. Applications that store or process Documents internally without returning raw content to the requester are not directly exposed to data exfiltration through this issue. This vulnerability is fixed in 1.1.2.

Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N · CWE-918

Tracked companies

LangChain (LangSmith)

Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

langchain-ai: langchain-text-splittersRed Hat: Migration Toolkit for Applications 8Red Hat: OpenShift LightspeedRed Hat: Red Hat Ansible Automation Platform 2Red Hat: Red Hat OpenShift AI (RHOAI)

References

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