Transform EPS file name to an absolute path before invoking Ghostscript

Tests/test_file_eps.py

@@ -301,6 +301,22 @@ def test_image_mode_not_supported(tmp_path: Path) -> None:
         im.save(tmpfile)
 
 
+@pytest.mark.skipif(not HAS_GHOSTSCRIPT, reason="Ghostscript not available")
+def test_filename_not_parsed_as_ghostscript_argument(
+    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
+) -> None:
+    # Check that a filename starting with "-" is not passed to Ghostscript unmodified
+    # If it was, the help functionality would be triggered instead
+    monkeypatch.chdir(tmp_path)
+    name = "-h"
+    with open(name, "wb") as f:
+        f.write(b"\n".join(simple_eps_file))
+
+    with Image.open(name) as im:
+        im.load()
+        assert im.size == (100, 100)
+
+
 @pytest.mark.skipif(not HAS_GHOSTSCRIPT, reason="Ghostscript not available")
 @skip_unless_feature("zlib")
 def test_render_scale1() -> None:

src/PIL/EpsImagePlugin.py

@@ -103,7 +103,10 @@ def Ghostscript(
 
     infile_temp = None
     if hasattr(fp, "name") and os.path.exists(fp.name):
-        infile = fp.name
+        # Make the path absolute so that a filename beginning with "-" or "@"
+        # can never be interpreted by Ghostscript's argument parser
+        # as an option or an @-file token
+        infile = os.path.abspath(fp.name)
     else:
         in_fd, infile_temp = tempfile.mkstemp()
         os.close(in_fd)