diff --git a/codex-rs/core/src/exec.rs b/codex-rs/core/src/exec.rs
index 47f8183cf8..0be3e109ce 100644
--- a/codex-rs/core/src/exec.rs
+++ b/codex-rs/core/src/exec.rs
@@ -225,7 +225,7 @@ pub(crate) async fn execute_exec_env(
     let ExecEnv {
         command,
         cwd,
-        env,
+        mut env,
         expiration,
         sandbox,
         windows_sandbox_level,
@@ -234,6 +234,10 @@ pub(crate) async fn execute_exec_env(
         arg0,
     } = env;
 
+    if let Some(network) = network.as_ref() {
+        network.apply_to_env(&mut env);
+    }
+
     let params = ExecParams {
         command,
         cwd,