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Vulnerability · Published Feb 11, 2026 · Assigned by GitHub_M

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

Medium 4.1

In plain English

A medium-severity server-side request forgery in langchainjs from langchain-ai. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.1Medium
Exploit odds (30 days)0.4%top 65.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npm@langchain/community1.1.14GHSA-gf3v-fwqg-4vh7

Affected products (as reported)

VendorProductVersions
langchain-ai langchainjs < 1.1.14

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N

References