CVE-2026-44520: Docling graph Docling-graph Has SSRF Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-fqph-j6v6-jvgx",
  "modified" : "2026-05-14T20:54:24Z",
  "published" : "2026-05-07T03:15:46Z",
  "aliases" : [ "CVE-2026-44520" ],
  "summary" : "docling-graph has SSRF via Missing Internal IP Validation in URLInputHandler",
  "details" : "### Impact\n\nThe `URLInputHandler` class in `docling_graph/core/input/handlers.py` makes HTTP requests to user-supplied URLs without validating whether the target resolves to a private, loopback, or link-local IP address. The `URLValidator` only checks for a valid scheme and non-empty `netloc`, performing no IP-level validation. Additionally, `requests.head()` was called with `allow_redirects=True`, allowing an attacker to redirect requests to internal endpoints via an intermediary URL.\n\nAn attacker who can control the `--source` CLI argument or `PipelineConfig.source` API parameter can trigger Server-Side Request Forgery (SSRF) to reach:\n- Cloud metadata endpoints (e.g. `169.254.169.254`) to steal IAM credentials\n- Internal services on loopback (`127.0.0.1`) or private network ranges (`10.x`, `172.16.x`, `192.168.x`)\n\nThis affects deployments where `docling-graph` processes URLs from untrusted input, such as multi-tenant pipelines or server-side automation.\n\n### Patches\n\nThe vulnerability is fixed in **v1.5.1**.\n\nUsers should upgrade immediately:\n```\npip install --upgrade docling-graph\n```\n\nThe fix adds IP validation via `ipaddress` and `socket.gethostbyname()` before any request is made, blocks private/loopback/link-local/reserved addresses, and disables redirect following (`allow_redirects=False`) with explicit validation of any `Location` header before following it.\n\n### Workarounds\n\nIf upgrading is not immediately possible, ensure that **all URLs passed to `URLInputHandler` come exclusively from trusted, internal sources**, never from user-supplied or external input. There is no safe code-level workaround short of applying the patch, as the vulnerability is in the library itself.\n\n### Resources\n\n- [CWE-918: Server-Side Request Forgery](https://cwe.mitre.org/data/definitions/918.html)\n- [OWASP SSRF Prevention Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html)\n- [AWS Instance Metadata endpoint](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "docling-graph"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.5.1"
      } ]
    } ],
    "database_specific" : {
      "last_known_affected_version_range" : "<= 1.5.0"
    }
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/docling-project/docling-graph/security/advisories/GHSA-fqph-j6v6-jvgx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-44520"
  }, {
    "type" : "WEB",
    "url" : "https://cheatsheetseries.owasp.org/cheatsheets/Server_Side_Request_Forgery_Prevention_Cheat_Sheet.html"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/docling-project/docling-graph"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-601", "CWE-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-07T03:15:46Z",
    "nvd_published_at" : "2026-05-14T18:16:50Z"
  }
}