diff --git a/pyrit/converter/add_image_text_converter.py b/pyrit/converter/add_image_text_converter.py
index 0906c91daa..913ad63b43 100644
--- a/pyrit/converter/add_image_text_converter.py
+++ b/pyrit/converter/add_image_text_converter.py
@@ -3,6 +3,7 @@
 
 import base64
 import logging
+import math
 from io import BytesIO
 from typing import cast
 
@@ -59,13 +60,14 @@ def __init__(
             bounding_box (tuple[int, int, int, int] | None): Optional (x1, y1, x2, y2) region to constrain
                 text within. When not set, the full image is used with a default margin.
                 Defaults to None.
-            rotation (float): Rotation angle in degrees for the text. Defaults to 0.0.
+            rotation (float): Rotation angle in degrees for the text. Must be finite. Defaults to 0.0.
             center_text (bool): Whether to center text horizontally and vertically within the bounding box.
                 Defaults to False.
 
         Raises:
             ValueError: If img_to_add is empty, font_name doesn't end with ".ttf",
-                font_size is invalid, or bounding_box coordinates are invalid.
+                font_size is invalid, bounding_box coordinates are invalid,
+                or rotation is non-finite.
         """
         if not img_to_add:
             raise ValueError("Please provide valid image path")
@@ -76,6 +78,8 @@ def __init__(
             x1, y1, x2, y2 = bounding_box
             if x2 <= x1 or y2 <= y1:
                 raise ValueError("bounding_box must have x2 > x1 and y2 > y1")
+        if not math.isfinite(rotation):
+            raise ValueError(f"rotation must be finite, got {rotation}")
         self._img_to_add = img_to_add
         self._font_name = font_name
         self._font_size = self._font_size_max
diff --git a/tests/unit/converter/test_add_image_text_converter.py b/tests/unit/converter/test_add_image_text_converter.py
index 504a980f35..e9f7baf5bf 100644
--- a/tests/unit/converter/test_add_image_text_converter.py
+++ b/tests/unit/converter/test_add_image_text_converter.py
@@ -256,3 +256,12 @@ def test_add_image_text_converter_auto_font_size_no_bounding_box(large_sample_im
     )
     updated_image = converter._add_text_to_image("Auto-sized text on full image")
     assert updated_image is not None
+
+
+@pytest.mark.parametrize("rotation", [float("nan"), float("inf"), float("-inf")])
+def test_add_image_text_converter_rejects_non_finite_rotation(
+    image_text_converter_sample_image: str, rotation: float
+) -> None:
+    """Non-finite rotation angles should fail during converter construction."""
+    with pytest.raises(ValueError, match="rotation must be finite"):
+        AddImageTextConverter(img_to_add=image_text_converter_sample_image, rotation=rotation)