diff --git a/libavcodec/siren.c b/libavcodec/siren.c
index 2161b29a2c..7f2b467860 100644
--- a/libavcodec/siren.c
+++ b/libavcodec/siren.c
@@ -648,6 +648,10 @@ static int decode_vector(SirenContext *s, int number_of_regions,
                 }
                 coefs_ptr++;
             }
+            if (i >= FF_ARRAY_ELEMS(noise_category5)) {
+                error = 1;
+                break;
+            }
 
             noise = decoder_standard_deviation[region] * noise_category5[i];
         } else