diff --git a/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension.cc b/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension.cc
index 93fb235dcd..234ac31b8b 100644
--- a/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension.cc
+++ b/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension.cc
@@ -354,10 +354,13 @@ bool RtpVideoLayersAllocationExtension::Parse(
   // Target bitrates.
   for (auto& layer : allocation->active_spatial_layers) {
     for (DataRate& rate : layer.target_bitrate_per_temporal_layer) {
-      rate = DataRate::KilobitsPerSec(ReadLeb128(read_at, end));
-      if (read_at == nullptr) {
+      uint64_t bitrate_kbps = ReadLeb128(read_at, end);
+      // bitrate_kbps might represent larger values than DataRate type,
+      // discard unreasonably large values.
+      if (read_at == nullptr || bitrate_kbps > 1'000'000) {
         return false;
       }
+      rate = DataRate::KilobitsPerSec(bitrate_kbps);
     }
   }
 
diff --git a/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension_unittest.cc b/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension_unittest.cc
index 92e5673441..17b4c4cfa6 100644
--- a/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension_unittest.cc
+++ b/modules/rtp_rtcp/source/rtp_video_layers_allocation_extension_unittest.cc
@@ -249,5 +249,12 @@ TEST(RtpVideoLayersAllocationExtension,
       RtpVideoLayersAllocationExtension::Write(buffer, written_allocation));
 }
 
+TEST(RtpVideoLayersAllocationExtension, DiscardsOverLargeDataRate) {
+  constexpr uint8_t buffer[] = {0x4b, 0xf6, 0xff, 0xff, 0xff, 0xff, 0xff,
+                                0xff, 0xcb, 0x78, 0xeb, 0x8d, 0xb5, 0x31};
+  VideoLayersAllocation allocation;
+  EXPECT_FALSE(RtpVideoLayersAllocationExtension::Parse(buffer, &allocation));
+}
+
 }  // namespace
 }  // namespace webrtc