fix: reject credential-bearing Git dependencies

Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

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):