Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
langchain-ai langchainjs
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangChain是LangChain开源的一个用于开发由大型语言模型 （LLM） 提供支持的应用程序的框架。 LangChain 1.1.14之前版本存在代码问题漏洞，该漏洞源于@langchain/community中的RecursiveUrlLoader类对URL验证不足，可能导致爬虫跟随攻击者控制的链接或获取内部基础设施内容。

CVSS 4.1 · Medium EPSS 0.35% · P26
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-26019

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
@langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
LangChain 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangChain是LangChain开源的一个用于开发由大型语言模型 （LLM） 提供支持的应用程序的框架。 LangChain 1.1.14之前版本存在代码问题漏洞，该漏洞源于@langchain/community中的RecursiveUrlLoader类对URL验证不足，可能导致爬虫跟随攻击者控制的链接或获取内部基础设施内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langchainjs < 1.1.14 -

II. Public POCs for CVE-2026-26019

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-26019

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-26019 (1)

Vendor Advisories for CVE-2026-26019 (1)

IV. Related Vulnerabilities

Same product: langchainjs
Same vendor: langchain-ai
Same weakness: CWE-918

V. Comments for CVE-2026-26019

No comments yet

Leave a comment