LangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawler that recursively follows links from a starting URL. Its preventOutside option (enabled by default) is intended to restrict crawling to the same site as the base URL. The implementation used String.startsWith() to compare URLs, which does not perform semantic URL validation. An attacker who controls content on a crawled page could include links to domains that share a string prefix with the target, causing the crawler to follow links to attacker-controlled or internal infrastructure. Additionally, the crawler performed no validation against private or reserved IP addresses. A crawled page could include links targeting cloud metadata services, localhost, or RFC 1918 addresses, and the crawler would fetch them without restriction. This vulnerability is fixed in 1.1.14.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-gf3v-fwqg-4vh7 @langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 12 Feb 2026 22:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 12 Feb 2026 09:45:00 +0000

Type Values Removed Values Added
First Time appeared Langchain-ai
Langchain-ai langchainjs
Vendors & Products Langchain-ai
Langchain-ai langchainjs

Wed, 11 Feb 2026 21:30:00 +0000

Type Values Removed Values Added
Description LangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawler that recursively follows links from a starting URL. Its preventOutside option (enabled by default) is intended to restrict crawling to the same site as the base URL. The implementation used String.startsWith() to compare URLs, which does not perform semantic URL validation. An attacker who controls content on a crawled page could include links to domains that share a string prefix with the target, causing the crawler to follow links to attacker-controlled or internal infrastructure. Additionally, the crawler performed no validation against private or reserved IP addresses. A crawled page could include links targeting cloud metadata services, localhost, or RFC 1918 addresses, and the crawler would fetch them without restriction. This vulnerability is fixed in 1.1.14.
Title @langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation
Weaknesses CWE-918
References
Metrics cvssV3_1

{'score': 4.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-02-12T21:14:41.756Z

Reserved: 2026-02-09T21:36:29.554Z

Link: CVE-2026-26019

cve-icon Vulnrichment

Updated: 2026-02-12T21:14:39.007Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-11T22:15:51.910

Modified: 2026-02-12T15:10:37.307

Link: CVE-2026-26019

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-12T09:35:29Z

Weaknesses