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Vulnerability record · CVE-2026-27795 · published 25 February 2026

CVE-2026-27795: Langchain community server-side request forgery (ssrf) vulnerability

Langchain · Langchain Community

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.

7.4 CVSS 3.1 High EPSS 0.38% · top 70.3% CWE-918 · Server-side request forgery (SSRF)
7.4CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/langchain-ai/langchainjs/commit/2812d2b2b9fd9343c4850e2ab906b8cf440975ee Patch
https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d Patch
https://github.com/langchain-ai/langchainjs/pull/9990 Issue Tracking
https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14 Release Notes
https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.18 Release Notes
https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7 Not Applicable
https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-mphv-75cg-56wg Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

4.1CVE-2026-26019Langchain community server-side request forgery (ssrf) vulnerabilityLangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawle…EPSS 0.34%10.0CVE-2026-83548SonicWall SMA1000 pre-auth SSRF via alternate access pathThe SMA1000 Appliance Work Place interface exposes an unintended alternate access path that allows server-side request forgery before authentication.…KEVEPSS 8.8%analysed10.0CVE-2026-49869Kestra OSS auth bypass via path suffix match enables RCEKestra OSS AuthenticationFilter whitelists the public config endpoint using request.getPath().endsWith("/configs"), a suffix match instead of an exac…KEVEPSS 2.1%analysed9.3CVE-2026-64849MLflow unauthenticated webhook test endpoint SSRF via redirectMLflow before 3.15.0 validates the webhook URL only on the original request, while the delivery code follows redirects and re-resolves the hostname w…KEVEPSS 9.8%analysed10.0CVE-2026-15409SonicWall SMA1000 Work Place SSRF allows unauthenticated requestsThe SMA1000 Appliance Work Place interface contains a server-side request forgery flaw (CWE-918) that lets the appliance be induced to make requests …KEVEPSS 6.8%analysed8.6CVE-2026-20230Cisco Unified CM SSRF enables file write and root escalationCisco Unified Communications Manager and Unified CM SME fail to properly validate input for specific HTTP requests, allowing server-side request forg…KEVEPSS 88%analysed7.5CVE-2021-22054VMware Workspace ONE UEM console unauthenticated SSRFThe Workspace ONE UEM console contains a server-side request forgery flaw in versions 20.0.8 before 20.0.8.37, 20.11.0 before 20.11.0.40, 21.2.0 befo…KEVEPSS 100%analysed9.8CVE-2021-22175GitLab unauthenticated SSRF via internal webhook requestsGitLab is vulnerable to server-side request forgery when requests to the internal network for webhooks are enabled. The flaw affects all versions sta…KEVEPSS 53%analysed

Source: NIST National Vulnerability Database (record CVE-2026-27795), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.