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@langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation

Type: advisorySources: OSV

LangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawler that recursively follows links from a starting URL. Its preventOutside option (enabled by default) is intended to restrict crawling to the same site as the base URL. The implementation used String.startsWith() to compare URLs, which does not perform semantic URL validation. An attacker who controls content on a crawled page could include links to domains that share a string prefix with the target, causing the crawler to follow links to attacker-controlled or internal infrastructure. Additionally, the crawler performed no validation against private or reserved IP addresses. A crawled page could include links targeting cloud metadata services, localhost, or RFC 1918 addresses, and the crawler would fetch them without restriction. This vulnerability is fixed in 1.1.14.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-26019
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 20:31 UTC · Revision 1

Source evidence

@langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation

core-osv · Original source

Published 11 Feb 2026, 21:11 UTC

LangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawler that recursively follows links from a starting URL. Its preventOutside option (enabled by default) is intended to restrict crawling to the same site as the base URL. The implementation used String.startsWith() to compare URLs, which does not perform semantic URL validation. An attacker who controls content on a crawled page could include links to domains that share a string prefix with the target, causing the crawler to follow links to attacker-controlled or internal infrastructure. Additionally, the crawler performed no validation against private or reserved IP addresses. A crawled page could include links targeting cloud metadata services, localhost, or RFC 1918 addresses, and the crawler would fetch them without restriction. This vulnerability is fixed in 1.1.14.

osv:CVE-2026-26019
Complete source record
{
  "id": "7aa5bf96e9e9cab914268f2fd24b6619978a6ff32a1360b930ebc5daf9de62d4",
  "url": "https://osv.dev/vulnerability/CVE-2026-26019",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "@langchain/community affected by SSRF Bypass in RecursiveUrlLoader via insufficient URL origin validation",
    "summary": "LangChain is a framework for building LLM-powered applications. Prior to 1.1.14, the RecursiveUrlLoader class in @langchain/community is a web crawler that recursively follows links from a starting URL. Its preventOutside option (enabled by default) is intended to restrict crawling to the same site as the base URL. The implementation used String.startsWith() to compare URLs, which does not perform semantic URL validation. An attacker who controls content on a crawled page could include links to domains that share a string prefix with the target, causing the crawler to follow links to attacker-controlled or internal infrastructure. Additionally, the crawler performed no validation against private or reserved IP addresses. A crawled page could include links targeting cloud metadata services, localhost, or RFC 1918 addresses, and the crawler would fetch them without restriction. This vulnerability is fixed in 1.1.14.",
    "evidence": "osv:CVE-2026-26019",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-26019",
      "aliases": [
        "CVE-2026-26019",
        "GHSA-gf3v-fwqg-4vh7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/langchain-ai/langchainjs",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "d4aa95a59d5136584be0f70d8bf74652fc536df0"
                },
                {
                  "fixed": "d5e3db0d01ab321ec70a875805b2f74aefdadf9d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:langchain:langchain_community:*:*:*:*:*:node.js:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "1.1.14"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d5e3db0d01ab321ec70a875805b2f74aefdadf9d"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
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              }
            }
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26019.json"
          }
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      ],
      "modified": "2026-10-28T02:30:31.927235204Z",
      "provider": "osv",
      "references": [
        "https://github.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcommunity%401.1.14",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26019.json",
        "https://github.com/langchain-ai/langchainjs/security/advisories/GHSA-gf3v-fwqg-4vh7",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-26019",
        "https://github.com/langchain-ai/langchainjs/commit/d5e3db0d01ab321ec70a875805b2f74aefdadf9d",
        "https://github.com/langchain-ai/langchainjs/pull/9990"
      ],
      "provider_metadata": {
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        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/26xxx/CVE-2026-26019.json"
      }
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      {
        "value": "CVE-2026-26019",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498952,
  "published_at": "2026-02-11T21:11:10.166+00:00"
}