diff --git a/src/uu/env/src/env.rs b/src/uu/env/src/env.rs
index 5e4b4fa18..7b36c7c63 100644
--- a/src/uu/env/src/env.rs
+++ b/src/uu/env/src/env.rs
@@ -3,7 +3,7 @@
 // For the full copyright and license information, please view the LICENSE
 // file that was distributed with this source code.
 
-// spell-checker:ignore (ToDO) chdir progname subcommand subcommands unsets setenv putenv spawnp SIGSEGV SIGBUS sigaction Sigmask sigprocmask
+// spell-checker:ignore (ToDO) chdir progname subcommand subcommands unsets setenv putenv spawnp SIGSEGV SIGBUS sigaction Sigmask sigprocmask elidable
 
 pub mod native_int_str;
 pub mod split_iterator;
@@ -168,10 +168,6 @@ fn parse_signal_opt(target: &mut SignalRequest, opt: &OsStr) -> UResult<()> {
     if opt.is_empty() {
         return Ok(());
     }
-    if opt == "__ALL__" {
-        target.apply_all = true;
-        return Ok(());
-    }
 
     for sig in opt
         .as_bytes()
@@ -193,7 +189,7 @@ fn parse_signal_opt(target: &mut SignalRequest, opt: &OsStr) -> UResult<()> {
 }
 
 #[cfg(unix)]
-#[derive(Default)]
+#[derive(Default, Debug)]
 struct SignalRequest {
     apply_all: bool,
     signals: BTreeSet<usize>,
@@ -268,7 +264,11 @@ impl SignalActionLog {
 }
 
 #[cfg(unix)]
-fn build_signal_request(matches: &clap::ArgMatches, option: &str) -> UResult<SignalRequest> {
+fn build_signal_request(
+    matches: &clap::ArgMatches,
+    option: &str,
+    signal_apply_all: &BTreeSet<&str>,
+) -> UResult<SignalRequest> {
     let mut request = SignalRequest::default();
     let mut provided_values = 0usize;
 
@@ -276,7 +276,9 @@ fn build_signal_request(matches: &clap::ArgMatches, option: &str) -> UResult<Sig
     if let Some(iter) = matches.get_many::<OsString>(option) {
         for opt in iter {
             if opt.is_empty() {
-                explicit_empty = true;
+                if !signal_apply_all.contains(option) {
+                    explicit_empty = true;
+                }
                 continue;
             }
             provided_values += 1;
@@ -538,6 +540,13 @@ struct EnvAppData {
     had_string_argument: bool,
 }
 
+struct ParsedArguments {
+    original_args: Vec<OsString>,
+    matches: clap::ArgMatches,
+    #[cfg(unix)]
+    signal_apply_all: BTreeSet<&'static str>,
+}
+
 impl EnvAppData {
     fn make_error_no_such_file_or_dir(&self, prog: &OsStr) -> Box<dyn UError> {
         uucore::show_error!(
@@ -634,17 +643,20 @@ impl EnvAppData {
     fn parse_arguments(
         &mut self,
         original_args: impl uucore::Args,
-    ) -> Result<(Vec<OsString>, clap::ArgMatches), Box<dyn UError>> {
+    ) -> Result<ParsedArguments, Box<dyn UError>> {
         let original_args: Vec<OsString> = original_args.collect();
-        let mut args = self.process_all_string_arguments(&original_args)?;
+        let args = self.process_all_string_arguments(&original_args)?;
+        #[cfg(unix)]
+        let mut signal_apply_all = BTreeSet::new();
 
-        for arg in &mut args {
+        #[cfg(unix)]
+        for arg in &args {
             if arg == "--ignore-signal" {
-                *arg = OsString::from("--ignore-signal=__ALL__");
+                signal_apply_all.insert(options::IGNORE_SIGNAL);
             } else if arg == "--default-signal" {
-                *arg = OsString::from("--default-signal=__ALL__");
+                signal_apply_all.insert(options::DEFAULT_SIGNAL);
             } else if arg == "--block-signal" {
-                *arg = OsString::from("--block-signal=__ALL__");
+                signal_apply_all.insert(options::BLOCK_SIGNAL);
             }
         }
 
@@ -669,11 +681,21 @@ impl EnvAppData {
                 }
             }
         };
-        Ok((original_args, matches))
+        Ok(ParsedArguments {
+            original_args,
+            matches,
+            #[cfg(unix)]
+            signal_apply_all,
+        })
     }
 
     fn run_env(&mut self, original_args: impl uucore::Args) -> UResult<()> {
-        let (original_args, matches) = self.parse_arguments(original_args)?;
+        let ParsedArguments {
+            original_args,
+            matches,
+            #[cfg(unix)]
+            signal_apply_all,
+        } = self.parse_arguments(original_args)?;
 
         self.do_debug_printing = self.do_debug_printing || (0 != matches.get_count("debug"));
         self.do_input_debug_printing = self
@@ -686,7 +708,11 @@ impl EnvAppData {
             }
         }
 
-        let mut opts = make_options(&matches)?;
+        let mut opts = make_options(
+            &matches,
+            #[cfg(unix)]
+            &signal_apply_all,
+        )?;
 
         apply_change_directory(&opts)?;
 
@@ -888,7 +914,11 @@ fn apply_removal_of_all_env_vars(opts: &Options<'_>) {
     }
 }
 
-fn make_options(matches: &clap::ArgMatches) -> UResult<Options<'_>> {
+#[cfg_attr(not(unix), allow(clippy::elidable_lifetime_names))]
+fn make_options<'a>(
+    matches: &'a clap::ArgMatches,
+    #[cfg(unix)] signal_apply_all: &BTreeSet<&'static str>,
+) -> UResult<Options<'a>> {
     let ignore_env = matches.get_flag("ignore-environment");
     let line_ending = LineEnding::from_zero_flag(matches.get_flag("null"));
     let running_directory = matches
@@ -907,11 +937,11 @@ fn make_options(matches: &clap::ArgMatches) -> UResult<Options<'_>> {
         .map(OsString::as_os_str);
 
     #[cfg(unix)]
-    let ignore_signal = build_signal_request(matches, options::IGNORE_SIGNAL)?;
+    let ignore_signal = build_signal_request(matches, options::IGNORE_SIGNAL, signal_apply_all)?;
     #[cfg(unix)]
-    let default_signal = build_signal_request(matches, options::DEFAULT_SIGNAL)?;
+    let default_signal = build_signal_request(matches, options::DEFAULT_SIGNAL, signal_apply_all)?;
     #[cfg(unix)]
-    let block_signal = build_signal_request(matches, options::BLOCK_SIGNAL)?;
+    let block_signal = build_signal_request(matches, options::BLOCK_SIGNAL, signal_apply_all)?;
     #[cfg(unix)]
     let list_signal_handling = matches.get_flag(options::LIST_SIGNAL_HANDLING);
 
diff --git a/tests/by-util/test_env.rs b/tests/by-util/test_env.rs
index cde3bccf4..4a989bd05 100644
--- a/tests/by-util/test_env.rs
+++ b/tests/by-util/test_env.rs
@@ -2009,3 +2009,22 @@ fn test_ignore_signal_pipe_broken_pipe_regression() {
         "With --ignore-signal=PIPE, process should exit gracefully (0 or 1), got: {ignore_signal_exit_code}"
     );
 }
+
+#[test]
+#[cfg(unix)]
+fn test_env_disallow_double_underscore_all() {
+    new_ucmd!()
+        .args(&["--ignore-signal=__ALL__", "true"])
+        .fails()
+        .stderr_contains("invalid signal");
+
+    new_ucmd!()
+        .args(&["--default-signal=__ALL__", "true"])
+        .fails()
+        .stderr_contains("invalid signal");
+
+    new_ucmd!()
+        .args(&["--block-signal=__ALL__", "true"])
+        .fails()
+        .stderr_contains("invalid signal");
+}