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RewindexCVEsLangChain (LangSmith)

CVE-2026-26019: @langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation

Medium · CVSS 4.1 (CVSS 3.1)EPSS 0.40%, 34th percentilePublished Updated Assigner: GitHub_M

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.

Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/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: langchainjs

References

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