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4.1 Moyenne

CVE-2026-27795 LangChain is a framework for building LLM-powered applications

Description

LangChain is a framework for building LLM-powered applications. Prior to version 1.1.8, a redirect-based Server-Side Request Forgery (SSRF) bypass exists in `RecursiveUrlLoader` in `@langchain/community`. The loader validates the initial URL but allows the underlying fetch to follow redirects automatically, which permits a transition from a safe public URL to an internal or metadata endpoint without revalidation. This is a bypass of the SSRF protections introduced in 1.1.14 (CVE-2026-26019). Users should upgrade to `@langchain/community` 1.1.18, which validates every redirect hop by disabling automatic redirects and re-validating `Location` targets before following them. In this version, automatic redirects are disabled (`redirect: "manual"`), each 3xx `Location` is resolved and validated with `validateSafeUrl()` before the next request, and a maximum redirect limit prevents infinite loops.

Produits et versions touchés

Produit Versions touchées Corrigé en
langchainjs 1.1 premières → < 1.1.18 1.1.18

Références

Chronologie

  1. Publiée
  2. Dernière modification

Autres CVE de langchainjs

Les 6 CVE de langchainjs →
CVE-2026-106119 LangChain is a framework for building LLM-powered applications 6.0 Moyenne CVE-2026-105799 LangChain is a framework for building LLM-powered applications 2.3 Faible CVE-2026-26019 LangChain is a framework for building LLM-powered applications 4.1 Moyenne CVE-2025-68665 LangChain is a framework for building LLM-powered applications 8.6 Élevée
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