diff --git a/test/app/fuzz/llvm_nvme_fuzz/llvm_nvme_fuzz.c b/test/app/fuzz/llvm_nvme_fuzz/llvm_nvme_fuzz.c
index 2c787aa4f..36c517866 100644
--- a/test/app/fuzz/llvm_nvme_fuzz/llvm_nvme_fuzz.c
+++ b/test/app/fuzz/llvm_nvme_fuzz/llvm_nvme_fuzz.c
@@ -781,6 +781,10 @@ TestOneInput(const uint8_t *data, size_t size)
 	int ret = 0;
 	struct spdk_nvme_detach_ctx *detach_ctx = NULL;
 
+	if (size < g_fuzzer->bytes_per_cmd) {
+		return -1;
+	}
+
 	g_ctrlr = spdk_nvme_connect(&g_trid, NULL, 0);
 	if (g_ctrlr == NULL) {
 		fprintf(stderr, "spdk_nvme_connect() failed for transport address '%s'\n",
diff --git a/test/app/fuzz/llvm_vfio_fuzz/llvm_vfio_fuzz.c b/test/app/fuzz/llvm_vfio_fuzz/llvm_vfio_fuzz.c
index 165a759e9..3ee380a06 100644
--- a/test/app/fuzz/llvm_vfio_fuzz/llvm_vfio_fuzz.c
+++ b/test/app/fuzz/llvm_vfio_fuzz/llvm_vfio_fuzz.c
@@ -107,6 +107,10 @@ TestOneInput(const uint8_t *data, size_t size)
 	char ctrlr_path[PATH_MAX];
 	int ret = 0;
 
+	if (size < g_fuzzer->bytes_per_cmd) {
+		return -1;
+	}
+
 	snprintf(ctrlr_path, sizeof(ctrlr_path), "%s/cntrl", g_ctrlr_path);
 	ret = access(ctrlr_path, F_OK);
 	if (ret != 0) {