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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-27795)

ID	Name	Product	Family	Type	Severity
465874	Echo: @langchain/community: security update to 1.1.18	Tenable Cloud Security	Echo Local Security Checks	Local	high
465874	Echo: @langchain/community: security update to 1.1.18	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
438078	SCA: security update for @langchain/community (GHSA-mphv-75cg-56wg)	Tenable Cloud Security	SCA Checks	Local	high
438078	SCA: security update for @langchain/community (GHSA-mphv-75cg-56wg)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-27795

high

Tenable Plugins

high

high

high

high