{
  "threat_severity" : "Moderate",
  "public_date" : "2026-02-25T17:30:01Z",
  "bugzilla" : {
    "description" : "langchain-core: @langchain/community: Server-Side Request Forgery (SSRF) bypass via redirect manipulation",
    "id" : "2442693",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2442693"
  },
  "cvss3" : {
    "cvss3_base_score" : "6.5",
    "cvss3_scoring_vector" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
    "status" : "draft"
  },
  "cwe" : "CWE-918",
  "details" : [ "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.", "A flaw was found in @langchain/community. The RecursiveUrlLoader component, which is responsible for loading URLs, fails to revalidate URLs after following redirects. This allows an attacker to bypass existing Server-Side Request Forgery (SSRF) protections by initially providing a safe public URL that then redirects to an internal or sensitive metadata endpoint. This could lead to unauthorized information disclosure or access to internal network resources." ],
  "statement" : "This vulnerability is rated MODERATE and affects Red Hat products that use the `@langchain/community` package, specifically the `RecursiveUrlLoader`. A redirect chaining flaw allows a Server-Side Request Forgery (SSRF) bypass, enabling redirection from a validated public URL to an internal or metadata endpoint without revalidation. This could expose internal resources.",
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    "cpe" : "cpe:/a:redhat:openshift_lightspeed"
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  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2026-27795\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-27795\nhttps://github.com/langchain-ai/langchainjs/commit/2812d2b2b9fd9343c4850e2ab906b8cf440975ee\nhttps://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d\nhttps://github.com/langchain-ai/langchainjs/pull/9990\nhttps://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14\nhttps://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.18\nhttps://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7\nhttps://github.com/langchain-ai/langchainjs/security/advisories/GHSA-mphv-75cg-56wg" ],
  "name" : "CVE-2026-27795",
  "csaw" : false
}