CVEvulnerability

CVE-2026-26019

4.1 MEDIUM Published 2026-02-11 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-02-11
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.1 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N
Weaknesses
CWE-918

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 configurations

• langchain langchain community (< 1.1.14)

Related

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References