CVE-2026-41481
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk17th percentile - higher than 17% of all known CVEs
Summary
In LangChain before version 1.1.2, an SSRF vulnerability exists in HTMLHeaderTextSplitter.split_text_from_url(). Although the initial URL is validated, redirects are not checked, allowing an attacker to access internal network resources.
Risk Assessment
The risk involves potential data exfiltration from internal servers, cloud, or localhost if the application returns processed documents to the user. Organizations may lose confidential information.
Recommendation
Immediately update the langchain-text-splitters library to version 1.1.2 or later. Additionally, consider disabling redirects in HTTP requests or implementing custom redirect validation.
Original NVD description (English source)
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.