id: PYSEC-2026-2458
published: "2026-07-13T15:15:40.718557Z"
modified: "2026-07-13T16:03:55.974437Z"
aliases:
- CVE-2026-44520
- GHSA-fqph-j6v6-jvgx
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)"
affected:
- package:
    name: docling-graph
    ecosystem: PyPI
    purl: pkg:pypi/docling-graph
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 1.5.1
  versions:
  - 0.2.4
  - 0.2.5
  - 0.3.0
  - 0.4.0
  - 0.4.1
  - 1.0.0
  - 1.1.0
  - 1.2.0
  - 1.2.1
  - 1.2.2
  - 1.2.3
  - 1.2.4
  - 1.3.0
  - 1.3.1
  - 1.4.0
  - 1.4.3
  - 1.4.4
  - 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
- type: PACKAGE
  url: https://pypi.org/project/docling-graph
- type: ADVISORY
  url: https://github.com/advisories/GHSA-fqph-j6v6-jvgx
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N