diff --git a/executor/programs/rust/ethrex/src/main.rs b/executor/programs/rust/ethrex/src/main.rs
index 30a39f4b5..4d42a804e 100644
--- a/executor/programs/rust/ethrex/src/main.rs
+++ b/executor/programs/rust/ethrex/src/main.rs
@@ -5,8 +5,16 @@ use lambda_vm_ethrex_crypto::LambdaVmEcsmCrypto;
 use rkyv::rancor::Error;
 
 pub fn main() {
-    let input = lambda_vm_syscalls::syscalls::get_private_input();
-    let input = rkyv::from_bytes::<ProgramInput, Error>(&input).unwrap();
+    // Zero-copy private input: `ef_io::read_input` returns a pointer+len into
+    // the memory-mapped input region (host pre-loads it before execution), so
+    // rkyv deserializes straight from the input. `get_private_input()` would
+    // `to_vec()` the whole input first — a full extra copy plus one large
+    // allocation (~52k cycles on a 20-tx block).
+    let mut input_ptr: *const u8 = core::ptr::null();
+    let mut input_len: usize = 0;
+    unsafe { lambda_vm_syscalls::ef_io::read_input(&mut input_ptr, &mut input_len) };
+    let input = unsafe { core::slice::from_raw_parts(input_ptr, input_len) };
+    let input = rkyv::from_bytes::<ProgramInput, Error>(input).unwrap();
     // LambdaVM crypto provider, defined in the lambda_vm repo and injected here
     // (so crypto changes don't require an ethrex PR — see `crypto/ethrex-crypto`).
     // It accelerates trait-routed `keccak256` (via the keccak_permute precompile)