diff --git a/apps/src/lib/node/ledger/shell/mod.rs b/apps/src/lib/node/ledger/shell/mod.rs
index 46e1defc60..8b93b84226 100644
--- a/apps/src/lib/node/ledger/shell/mod.rs
+++ b/apps/src/lib/node/ledger/shell/mod.rs
@@ -48,6 +48,7 @@ use namada::ledger::storage::{
     DBIter, Sha256Hasher, Storage, StorageHasher, TempWlStorage, WlStorage, DB,
     EPOCH_SWITCH_BLOCKS_DELAY,
 };
+use namada::ledger::storage_api::tx::validate_tx_bytes;
 use namada::ledger::storage_api::{self, StorageRead};
 use namada::ledger::{parameters, pos, protocol};
 use namada::proof_of_stake::{self, process_slashes, read_pos_params, slash};
@@ -1071,6 +1072,15 @@ where
         const VALID_MSG: &str = "Mempool validation passed";
         const INVALID_MSG: &str = "Mempool validation failed";
 
+        // Tx size check
+        if !validate_tx_bytes(&self.wl_storage, tx_bytes.len())
+            .expect("Failed to get max tx bytes param from storage")
+        {
+            response.code = ErrorCodes::TooLarge.into();
+            response.log = format!("{INVALID_MSG}: Tx too large");
+            return response;
+        }
+
         // Tx format check
         let tx = match Tx::try_from(tx_bytes).map_err(Error::TxDecoding) {
             Ok(t) => t,
diff --git a/apps/src/lib/node/ledger/shell/process_proposal.rs b/apps/src/lib/node/ledger/shell/process_proposal.rs
index 4968faa050..19469d10fc 100644
--- a/apps/src/lib/node/ledger/shell/process_proposal.rs
+++ b/apps/src/lib/node/ledger/shell/process_proposal.rs
@@ -7,6 +7,7 @@ use namada::core::ledger::storage::WlStorage;
 use namada::ledger::pos::PosQueries;
 use namada::ledger::protocol::get_fee_unshielding_transaction;
 use namada::ledger::storage::TempWlStorage;
+use namada::ledger::storage_api::tx::validate_tx_bytes;
 use namada::proof_of_stake::find_validator_by_raw_hash;
 use namada::types::internal::TxInQueue;
 use namada::types::transaction::protocol::{
@@ -457,6 +458,16 @@ where
     where
         CA: 'static + WasmCacheAccess + Sync,
     {
+        // check tx bytes
+        if !validate_tx_bytes(&self.wl_storage, tx_bytes.len())
+            .expect("Failed to get max tx bytes param from storage")
+        {
+            return TxResult {
+                code: ErrorCodes::TooLarge.into(),
+                info: "Tx too large".into(),
+            };
+        }
+
         // try to allocate space for this tx
         if let Err(e) = metadata.txs_bin.try_dump(tx_bytes) {
             return TxResult {