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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-27795 Detail

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.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/langchain-ai/langchainjs/commit/2812d2b2b9fd9343c4850e2ab906b8cf440975ee GitHub, Inc.
https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d GitHub, Inc.
https://github.com/langchain-ai/langchainjs/pull/9990 GitHub, Inc.
https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14 GitHub, Inc.
https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.18 GitHub, Inc.
https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7 GitHub, Inc.
https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-mphv-75cg-56wg GitHub, Inc.

Weakness Enumeration

CWE-ID CWE Name Source
CWE-918 Server-Side Request Forgery (SSRF) GitHub, Inc.  

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-27795
NVD Published Date:
02/25/2026
NVD Last Modified:
02/25/2026
Source:
GitHub, Inc.