diff --git a/libavformat/iamf_parse.c b/libavformat/iamf_parse.c
index cb49cf0a57..210cadd85a 100644
--- a/libavformat/iamf_parse.c
+++ b/libavformat/iamf_parse.c
@@ -933,6 +933,10 @@ static int mix_presentation_obu(void *s, IAMFContext *c, AVIOContext *pb, int le
             if (submix_layout->layout_type == 2) {
                 int sound_system;
                 sound_system = (byte >> 2) & 0xF;
+                if (sound_system >= FF_ARRAY_ELEMS(ff_iamf_sound_system_map)) {
+                    ret = AVERROR_INVALIDDATA;
+                    goto fail;
+                }
                 av_channel_layout_copy(&submix_layout->sound_system, &ff_iamf_sound_system_map[sound_system].layout);
             }