What is the CVSS score of CVE-2026-27795?

CVE-2026-27795 has a CVSS 3.1 base score of 4.1 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Langchain are affected by CVE-2026-27795?

Organizations using is a framework for building LLM-powered applications. should be aware of moderate risk from CVE-2026-27795, a server-side request forgery vulnerability rated CVSS 4.1.. A patch is available.

How to fix or mitigate CVE-2026-27795?

Within 30 days: Identify affected systems running is a framework for building LLM-powered applications. and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Langchain CVE-2026-27795

MEDIUM

Server-Side Request Forgery (SSRF) (CWE-918)

2026-02-25 security-advisories@github.com

GHSA-mphv-75cg-56wg

SSRF Langchain Langchain Community

4.1

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.1 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N

Red Hat

6.5 MEDIUM

qualitative

Primary rating from GitHub Advisory.

CVSS VectorGitHub Advisory

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

CVE Published

Feb 25, 2026 - 18:23 nvd

MEDIUM 4.1

Blast Radius

ecosystem impact

† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth

49 npm packages depend on @langchain/community (2 direct, 47 indirect)

Ecosystem-wide dependent count for version 1.1.18.

DescriptionGitHub Advisory

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.

AnalysisAI

LangChain's RecursiveUrlLoader in @langchain/community versions prior to 1.1.18 fails to validate redirect targets, allowing authenticated attackers to bypass SSRF protections by redirecting from whitelisted URLs to internal or metadata endpoints. An attacker with user credentials can exploit this to access sensitive internal resources or cloud metadata services through automatic redirect following. Affected applications should upgrade to version 1.1.18, which disables automatic redirects and re-validates each redirect destination.

Technical ContextAI

This vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affects LangChain is a framework for building LLM-powered applications.. 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). Use