diff --git a/libavformat/aadec.c b/libavformat/aadec.c
index dc94061dcf..b9dd51ebfc 100644
--- a/libavformat/aadec.c
+++ b/libavformat/aadec.c
@@ -85,6 +85,7 @@ static int aa_read_header(AVFormatContext *s)
     AADemuxContext *c = s->priv_data;
     AVIOContext *pb = s->pb;
     AVStream *st;
+    int ret;
 
     /* parse .aa header */
     avio_skip(pb, 4); // file size
@@ -118,8 +119,12 @@ static int aa_read_header(AVFormatContext *s)
             header_seed = atoi(val);
         } else if (!strcmp(key, "HeaderKey")) { // this looks like "1234567890 1234567890 1234567890 1234567890"
             av_log(s, AV_LOG_DEBUG, "HeaderKey is <%s>\n", val);
-            sscanf(val, "%"SCNu32"%"SCNu32"%"SCNu32"%"SCNu32,
+
+            ret = sscanf(val, "%"SCNu32"%"SCNu32"%"SCNu32"%"SCNu32,
                    &header_key_part[0], &header_key_part[1], &header_key_part[2], &header_key_part[3]);
+            if (ret != 4)
+                return AVERROR_INVALIDDATA;
+
             for (idx = 0; idx < 4; idx++) {
                 AV_WB32(&header_key[idx * 4], header_key_part[idx]); // convert each part to BE!
             }