CVE-2026-27795: LangChain RecursiveUrlLoader SSRF bypass through redirects

Summary

Prior to version 1.1.8, the `RecursiveUrlLoader` in `@langchain/community` contains a redirect-based SSRF bypass. The loader validates the initial URL but lets the underlying fetch follow redirects automatically, so a request can move from a safe public URL to an internal or metadata endpoint without revalidation. The flaw bypasses the SSRF protections introduced in 1.1.14 (CVE-2026-26019).

Mitigation

Upgrade `@langchain/community` to 1.1.18, which disables automatic redirects (`redirect: "manual"`), resolves and validates each 3xx `Location` target with `validateSafeUrl()` before the next request, and enforces a maximum redirect limit.

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

• @langchain/communitynpmLLM dependency since 2023-12-08 · 4 tracked dependents

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