diff --git a/libs/cli/README.md b/libs/cli/README.md
index cac7808bb..82016c0b9 100644
--- a/libs/cli/README.md
+++ b/libs/cli/README.md
@@ -103,6 +103,8 @@ The CLI uses a `langgraph.json` configuration file with these key settings:
 }
 ```
 
+Git dependencies must use credential-free URLs. The CLI rejects HTTP Git URLs with userinfo because generated Dockerfiles and image layers can retain embedded usernames or tokens. For private dependencies, provide short-lived credentials through your build environment's secret-backed Git credential helper. Do not store credentials in `langgraph.json`, requirement or lock files, or a `pip_config_file` copied into the image.
+
 See the [full documentation](https://reference.langchain.com/python/langgraph-cli) for detailed configuration options.
 
 ## Development
diff --git a/libs/cli/langgraph_cli/config.py b/libs/cli/langgraph_cli/config.py
index 57b225187..ecf3cc894 100644
--- a/libs/cli/langgraph_cli/config.py
+++ b/libs/cli/langgraph_cli/config.py
@@ -36,6 +36,7 @@ DISALLOWED_BUILD_COMMAND_CHARS = [
 # This blocks background execution (cmd &) while allowing command
 # chaining (cmd1 && cmd2) which is common in build commands.
 _SINGLE_AMPERSAND_RE = re.compile(r"(?<!&)&(?:&&)*(?!&)")
+_GIT_HTTP_AUTHORITY_RE = re.compile(r"git\+https?://(?P<authority>[^/\s]+)", re.I)
 _API_VERSION_PATTERN = re.compile(
     r"^(?P<major>\d+)"
     r"(?:\.(?P<minor>\d+))?"
@@ -78,6 +79,14 @@ def has_disallowed_build_command_content(command: str) -> bool:
     return False
 
 
+def _has_git_http_url_userinfo(dependency: str) -> bool:
+    """Check whether a Git HTTP URL contains userinfo."""
+    return any(
+        "@" in match.group("authority")
+        for match in _GIT_HTTP_AUTHORITY_RE.finditer(dependency)
+    )
+
+
 MIN_PYTHON_VERSION = "3.11"
 DEFAULT_PYTHON_VERSION = "3.11"
 
@@ -415,6 +424,18 @@ def validate_config(config: Config) -> Config:
                 '  "source": {"kind": "uv", "root": ".."}'
             )
 
+    if any(
+        isinstance(dependency, str) and _has_git_http_url_userinfo(dependency)
+        for dependency in config["dependencies"]
+    ):
+        raise click.UsageError(
+            "Git dependency URLs must not contain credentials or other URL "
+            "userinfo because generated Dockerfiles and image layers can retain "
+            "them. Use a credential-free Git URL and provide short-lived "
+            "credentials through your build environment's secret-backed Git "
+            "credential helper."
+        )
+
     source = config.get("source")
     source_kind = _get_source_kind(config)
     if source is not None and not isinstance(source, dict):
diff --git a/libs/cli/langgraph_cli/schemas.py b/libs/cli/langgraph_cli/schemas.py
index 5a00fc673..6678d7d67 100644
--- a/libs/cli/langgraph_cli/schemas.py
+++ b/libs/cli/langgraph_cli/schemas.py
@@ -689,6 +689,9 @@ class Config(TypedDict, total=False):
       - "." or "./src" if you have a local Python package
       - str (aka "anthropic") for a PyPI package
       - "git+https://github.com/org/repo.git@main" for a Git-based package
+    Git HTTP URLs must not contain userinfo such as a username or token. For private
+    dependencies, provide short-lived credentials through the build environment's
+    secret-backed Git credential helper.
     Defaults to an empty list, meaning no additional packages installed beyond your base environment.
 
     This field is not supported when `source.kind` is `uv`.
diff --git a/libs/cli/tests/unit_tests/test_config.py b/libs/cli/tests/unit_tests/test_config.py
index c8b24020c..3d34f415d 100644
--- a/libs/cli/tests/unit_tests/test_config.py
+++ b/libs/cli/tests/unit_tests/test_config.py
@@ -255,6 +255,50 @@ def test_validate_config():
         )
 
 
+@pytest.mark.parametrize(
+    "dependency",
+    [
+        "git+https://user:secret-token@github.com/org/private.git@main",
+        "private-package @ git+http://token@github.com/org/private.git",
+        "git+HTTPS://user%40example.com:secret%2Ftoken@github.com/org/private.git",
+    ],
+)
+def test_validate_config_rejects_git_http_url_userinfo(dependency: str):
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config(
+            {
+                "python_version": "3.11",
+                "dependencies": [dependency],
+                "graphs": {"agent": "./agent.py:graph"},
+            }
+        )
+
+    message = str(exc_info.value)
+    assert "must not contain credentials or other URL userinfo" in message
+    assert "secret-token" not in message
+    assert "secret%2Ftoken" not in message
+
+
+@pytest.mark.parametrize(
+    "dependency",
+    [
+        "git+https://github.com/org/public.git@main",
+        "private-package @ git+https://github.com/org/private.git@main",
+        "git+ssh://git@github.com/org/private.git@main",
+    ],
+)
+def test_validate_config_allows_git_urls_without_http_userinfo(dependency: str):
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": [dependency],
+            "graphs": {"agent": "./agent.py:graph"},
+        }
+    )
+
+    assert config["dependencies"] == [dependency]
+
+
 def test_validate_config_image_distro():
     """Test validation of image_distro field."""
     # Valid image_distro values should work