Cloudanix VulnDB

GHSA-fv5p-p927-qmxr

Medium · 6.5

LangChain Text Splitters: HTMLHeaderTextSplitter.split_text_from_url SSRF Redirect Bypass

CVSS

6.5

EPSS

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Published

Apr 16, 2026

CISA due date

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The record

`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.

Affected packages

Ecosystem Package Introduced Fixed

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