security: fix SSRF in load_image and load_video URL fetching

src/diffusers/utils/loading_utils.py

@@ -1,4 +1,6 @@
+import ipaddress
 import os
+import socket
 import tempfile
 from typing import Any, Callable
 from urllib.parse import unquote, urlparse
@@ -11,6 +13,48 @@
 from .import_utils import BACKENDS_MAPPING, is_imageio_available
 
 
+_BLOCKED_IPV4 = [
+    ipaddress.ip_network("127.0.0.0/8"),
+    ipaddress.ip_network("10.0.0.0/8"),
+    ipaddress.ip_network("172.16.0.0/12"),
+    ipaddress.ip_network("192.168.0.0/16"),
+    ipaddress.ip_network("169.254.0.0/16"),
+    ipaddress.ip_network("100.64.0.0/10"),
+    ipaddress.ip_network("0.0.0.0/8"),
+]
+_BLOCKED_IPV6 = [
+    ipaddress.ip_network("::1/128"),
+    ipaddress.ip_network("fc00::/7"),
+    ipaddress.ip_network("fe80::/10"),
+]
+
+
+def _validate_url(url: str) -> None:
+    """Raise ValueError if url resolves to a private/reserved IP address (SSRF prevention)."""
+    parsed = urlparse(url)
+    if parsed.scheme not in ("http", "https"):
+        raise ValueError(f"URL scheme {parsed.scheme!r} is not allowed.")
+    if not parsed.hostname:
+        raise ValueError(f"URL has no hostname: {url!r}")
+    try:
+        infos = socket.getaddrinfo(parsed.hostname, parsed.port or (443 if parsed.scheme == "https" else 80))
+    except socket.gaierror as exc:
+        raise ValueError(f"Cannot resolve hostname {parsed.hostname!r}: {exc}") from exc
+    for _family, _, _, _, sockaddr in infos:
+        try:
+            addr = ipaddress.ip_address(sockaddr[0])
+            if isinstance(addr, ipaddress.IPv6Address) and addr.ipv4_mapped:
+                addr = addr.ipv4_mapped
+            nets = _BLOCKED_IPV4 if isinstance(addr, ipaddress.IPv4Address) else _BLOCKED_IPV6
+            if any(addr in net for net in nets):
+                raise ValueError(
+                    f"URL {url!r} resolves to private/reserved IP address {addr}. "
+                    "Requests to internal network addresses are not allowed."
+                )
+        except ValueError:
+            raise
+
+
 def load_image(
     image: str | PIL.Image.Image, convert_method: Callable[[PIL.Image.Image], PIL.Image.Image] | None = None
 ) -> PIL.Image.Image:
@@ -30,6 +74,7 @@ def load_image(
     """
     if isinstance(image, str):
         if image.startswith("http://") or image.startswith("https://"):
+            _validate_url(image)
             image = PIL.Image.open(requests.get(image, stream=True, timeout=DIFFUSERS_REQUEST_TIMEOUT).raw)
         elif os.path.isfile(image):
             image = PIL.Image.open(image)
@@ -82,6 +127,7 @@ def load_video(
         )
 
     if is_url:
+        _validate_url(video)
         response = requests.get(video, stream=True)
         if response.status_code != 200:
             raise ValueError(f"Failed to download video. Status code: {response.status_code}")