diff --git a/vllm/multimodal/media/video.py b/vllm/multimodal/media/video.py
index f1f5783b0e..7528331cdf 100644
--- a/vllm/multimodal/media/video.py
+++ b/vllm/multimodal/media/video.py
@@ -190,7 +190,7 @@ class VideoMediaIO(MediaIO[MediaWithBytes[tuple[DecodedFrames, dict[str, Any]]]]
             }
             return MediaWithBytes((frames, metadata), data.encode())
 
-        return self.load_bytes(pybase64.b64decode(data))
+        return self.load_bytes(pybase64.b64decode(data, validate=True))
 
     def load_file(
         self, filepath: Path