diff --git a/libavcodec/d3d12va_vp9.c b/libavcodec/d3d12va_vp9.c
index 6f1f933fdd..f224044279 100644
--- a/libavcodec/d3d12va_vp9.c
+++ b/libavcodec/d3d12va_vp9.c
@@ -88,12 +88,18 @@ static int d3d12va_vp9_decode_slice(AVCodecContext *avctx, const uint8_t *buffer
 
 static int update_input_arguments(AVCodecContext *avctx, D3D12_VIDEO_DECODE_INPUT_STREAM_ARGUMENTS *input_args, ID3D12Resource *buffer)
 {
+    D3D12VADecodeContext    *ctx     = D3D12VA_DECODE_CONTEXT(avctx);
     const VP9SharedContext  *h       = avctx->priv_data;
     VP9DecodePictureContext *ctx_pic = h->frames[CUR_FRAME].hwaccel_picture_private;
 
     void *mapped_data;
     D3D12_VIDEO_DECODE_FRAME_ARGUMENT *args;
 
+    if (ctx_pic->slice.SliceBytesInBuffer > ctx->bitstream_size) {
+        av_log(avctx, AV_LOG_ERROR, "Input frame bitstream size exceeds internal buffer!\n");
+        return AVERROR(EINVAL);
+    }
+
     if (FAILED(ID3D12Resource_Map(buffer, 0, NULL, &mapped_data))) {
         av_log(avctx, AV_LOG_ERROR, "Failed to map D3D12 Buffer resource!\n");
         return AVERROR(EINVAL);