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

LangChain: HTMLHeaderTextSplitter.split_text_from_url SSRF Redirect Bypass

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

服务端请求伪造(SSRF)

langchain-text-splitters 代码问题漏洞

langchain-text-splitters是LangChain开源的一个Python包。 langchain-text-splitters 1.1.2之前版本存在代码问题漏洞，该漏洞源于HTMLHeaderTextSplitter.split_text_from_url()验证初始URL后使用requests.get()获取时启用了重定向，重定向目标未重新验证，导致指向攻击者控制服务器的URL可重定向到内部、本地主机或云元数据端点，绕过SSRF保护。

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