diff --git a/src/Symfony/Bridge/Twig/Command/LintCommand.php b/src/Symfony/Bridge/Twig/Command/LintCommand.php
index be49df5fdf..20db8c5de1 100644
--- a/src/Symfony/Bridge/Twig/Command/LintCommand.php
+++ b/src/Symfony/Bridge/Twig/Command/LintCommand.php
@@ -81,7 +81,7 @@ EOF
         $showDeprecations = $input->getOption('show-deprecations');
 
         if (['-'] === $filenames) {
-            return $this->display($input, $output, $io, [$this->validate($this->getStdin(), uniqid('sf_', true))]);
+            return $this->display($input, $output, $io, [$this->validate(file_get_contents('php://stdin'), uniqid('sf_', true))]);
         }
 
         if (!$filenames) {
@@ -89,7 +89,7 @@ EOF
             if (0 === ftell(STDIN)) {
                 @trigger_error('Piping content from STDIN to the "lint:twig" command without passing the dash symbol "-" as argument is deprecated since Symfony 4.4.', E_USER_DEPRECATED);
 
-                return $this->display($input, $output, $io, [$this->validate($this->getStdin(), uniqid('sf_', true))]);
+                return $this->display($input, $output, $io, [$this->validate(file_get_contents('php://stdin'), uniqid('sf_', true))]);
             }
 
             $loader = $this->twig->getLoader();
@@ -132,16 +132,6 @@ EOF
         return $this->display($input, $output, $io, $filesInfo);
     }
 
-    private function getStdin(): string
-    {
-        $template = '';
-        while (!feof(STDIN)) {
-            $template .= fread(STDIN, 1024);
-        }
-
-        return $template;
-    }
-
     private function getFilesInfo(array $filenames): array
     {
         $filesInfo = [];
diff --git a/src/Symfony/Component/Console/Helper/QuestionHelper.php b/src/Symfony/Component/Console/Helper/QuestionHelper.php
index 80906db4ed..bba719b534 100644
--- a/src/Symfony/Component/Console/Helper/QuestionHelper.php
+++ b/src/Symfony/Component/Console/Helper/QuestionHelper.php
@@ -115,7 +115,7 @@ class QuestionHelper extends Helper
     {
         $this->writePrompt($output, $question);
 
-        $inputStream = $this->inputStream ?: STDIN;
+        $inputStream = $this->inputStream ?: fopen('php://stdin', 'r');
         $autocomplete = $question->getAutocompleterCallback();
 
         if (null === $autocomplete || !Terminal::hasSttyAvailable()) {
diff --git a/src/Symfony/Component/Translation/Command/XliffLintCommand.php b/src/Symfony/Component/Translation/Command/XliffLintCommand.php
index f078b55bbf..770a15e209 100644
--- a/src/Symfony/Component/Translation/Command/XliffLintCommand.php
+++ b/src/Symfony/Component/Translation/Command/XliffLintCommand.php
@@ -85,7 +85,7 @@ EOF
         $this->displayCorrectFiles = $output->isVerbose();
 
         if (['-'] === $filenames) {
-            return $this->display($io, [$this->validate($this->getStdin())]);
+            return $this->display($io, [$this->validate(file_get_contents('php://stdin'))]);
         }
 
         // @deprecated to be removed in 5.0
@@ -96,7 +96,7 @@ EOF
 
             @trigger_error('Piping content from STDIN to the "lint:xliff" command without passing the dash symbol "-" as argument is deprecated since Symfony 4.4.', E_USER_DEPRECATED);
 
-            return $this->display($io, [$this->validate($this->getStdin())]);
+            return $this->display($io, [$this->validate(file_get_contents('php://stdin'))]);
         }
 
         $filesInfo = [];
@@ -230,16 +230,6 @@ EOF
         }
     }
 
-    private function getStdin(): string
-    {
-        $xliff = '';
-        while (!feof(STDIN)) {
-            $xliff .= fread(STDIN, 1024);
-        }
-
-        return $xliff;
-    }
-
     private function getDirectoryIterator(string $directory)
     {
         $default = function ($directory) {
diff --git a/src/Symfony/Component/Yaml/Command/LintCommand.php b/src/Symfony/Component/Yaml/Command/LintCommand.php
index d15ffb38c8..65ef531ffe 100644
--- a/src/Symfony/Component/Yaml/Command/LintCommand.php
+++ b/src/Symfony/Component/Yaml/Command/LintCommand.php
@@ -88,7 +88,7 @@ EOF
         $flags = $input->getOption('parse-tags') ? Yaml::PARSE_CUSTOM_TAGS : 0;
 
         if (['-'] === $filenames) {
-            return $this->display($io, [$this->validate($this->getStdin(), $flags)]);
+            return $this->display($io, [$this->validate(file_get_contents('php://stdin'), $flags)]);
         }
 
         // @deprecated to be removed in 5.0
@@ -96,7 +96,7 @@ EOF
             if (0 === ftell(STDIN)) {
                 @trigger_error('Piping content from STDIN to the "lint:yaml" command without passing the dash symbol "-" as argument is deprecated since Symfony 4.4.', E_USER_DEPRECATED);
 
-                return $this->display($io, [$this->validate($this->getStdin(), $flags)]);
+                return $this->display($io, [$this->validate(file_get_contents('php://stdin'), $flags)]);
             }
 
             throw new RuntimeException('Please provide a filename or pipe file content to STDIN.');
@@ -215,16 +215,6 @@ EOF
         }
     }
 
-    private function getStdin(): string
-    {
-        $yaml = '';
-        while (!feof(STDIN)) {
-            $yaml .= fread(STDIN, 1024);
-        }
-
-        return $yaml;
-    }
-
     private function getParser(): Parser
     {
         if (!$this->parser) {