fix(huggingface): harden hostname validation and reject URLs in repo_id (#36831)

libs/partners/huggingface/langchain_huggingface/embeddings/huggingface_endpoint.py

@@ -65,6 +65,12 @@ class HuggingFaceEndpointEmbeddings(BaseModel, Embeddings):
     @model_validator(mode="after")
     def validate_environment(self) -> Self:
         """Validate that api key and python package exists in environment."""
+        for field_name in ("model", "repo_id"):
+            value = getattr(self, field_name)
+            if value and value.startswith(("http://", "https://")):
+                msg = f"`{field_name}` must be a HuggingFace repo ID, not a URL."
+                raise ValueError(msg)
+
         huggingfacehub_api_token = self.huggingfacehub_api_token or os.getenv(
             "HF_TOKEN"
         )

libs/partners/huggingface/langchain_huggingface/llms/huggingface_endpoint.py

@@ -5,6 +5,7 @@ import logging
 import os
 from collections.abc import AsyncIterator, Iterator, Mapping
 from typing import Any
+from urllib.parse import urlparse
 
 from langchain_core.callbacks import (
     AsyncCallbackManagerForLLMRun,
@@ -23,8 +24,12 @@ def _is_huggingface_hosted_url(url: str | None) -> bool:
     """True if url is HF-hosted (huggingface.co or hf.space)."""
     if not url:
         return False
-    url_lower = url.lower().strip()
+    hostname = (urlparse(url).hostname or "").lower()
-    return "huggingface.co" in url_lower or "hf.space" in url_lower
+    return (
+        hostname == "huggingface.co"
+        or hostname == "hf.space"
+        or hostname.endswith((".huggingface.co", ".hf.space"))
+    )
 
 
 VALID_TASKS = (
@@ -220,6 +225,13 @@ class HuggingFaceEndpoint(LLM):
         endpoint_url = values.get("endpoint_url")
         repo_id = values.get("repo_id")
 
+        if repo_id and repo_id.startswith(("http://", "https://")):
+            msg = (
+                "`repo_id` must be a HuggingFace repo ID, not a URL. "
+                "Use `endpoint_url` for direct endpoints."
+            )
+            raise ValueError(msg)
+
         if sum([bool(model), bool(endpoint_url), bool(repo_id)]) > 1:
             msg = (
                 "Please specify either a `model` OR an `endpoint_url` OR a `repo_id`,"