diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 18d8d8fc11..39b1b5d552 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -1256,6 +1256,11 @@ static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
         descr->sl.timestamp_res      = avio_rb32(&d->pb);
                                        avio_rb32(&d->pb);
         descr->sl.timestamp_len      = avio_r8(&d->pb);
+        if (descr->sl.timestamp_len > 64) {
+            avpriv_request_sample(NULL, "timestamp_len > 64");
+            descr->sl.timestamp_len = 64;
+            return AVERROR_PATCHWELCOME;
+        }
         descr->sl.ocr_len            = avio_r8(&d->pb);
         descr->sl.au_len             = avio_r8(&d->pb);
         descr->sl.inst_bitrate_len   = avio_r8(&d->pb);