diff --git a/src/fenrirscreenreader/commands/commands/bookmark_base.py b/src/fenrirscreenreader/commands/commands/bookmark_base.py
index 84f9b3f4..4bb4930f 100644
--- a/src/fenrirscreenreader/commands/commands/bookmark_base.py
+++ b/src/fenrirscreenreader/commands/commands/bookmark_base.py
@@ -4,6 +4,9 @@
 # Fenrir TTY screen reader
 # By Chrys, Storm Dragon, and contributers.
 
+import gettext
+_ = gettext.gettext
+
 from fenrirscreenreader.utils import mark_utils
 from fenrirscreenreader.utils import line_utils
 
diff --git a/src/fenrirscreenreader/core/applicationManager.py b/src/fenrirscreenreader/core/applicationManager.py
index bef73a90..b05fde9a 100644
--- a/src/fenrirscreenreader/core/applicationManager.py
+++ b/src/fenrirscreenreader/core/applicationManager.py
@@ -16,16 +16,16 @@ class applicationManager():
     def getCurrentApplication(self):
         currApp = self.env['screen']['newApplication'].upper()
         if not currApp:
-            currApp == 'DEFAULT' 
+            currApp = 'DEFAULT' 
         if currApp == '':
-            currApp == 'DEFAULT'
+            currApp = 'DEFAULT'
         return currApp
     def getPrevApplication(self):
         prevApp = self.env['screen']['oldApplication'].upper()
         if not prevApp:
-            prevApp == 'DEFAULT' 
+            prevApp = 'DEFAULT' 
         if prevApp == '':
-            prevApp == 'DEFAULT' 
+            prevApp = 'DEFAULT' 
         return prevApp
     def isApplicationChange(self):
         return self.env['screen']['oldApplication'] != self.env['screen']['newApplication']
diff --git a/src/fenrirscreenreader/core/memoryManager.py b/src/fenrirscreenreader/core/memoryManager.py
index 6dccf7be..0798539c 100644
--- a/src/fenrirscreenreader/core/memoryManager.py
+++ b/src/fenrirscreenreader/core/memoryManager.py
@@ -92,7 +92,7 @@ class memoryManager():
     def clearCurrentIndexList(self, name):
         if not self.listStorageValid(name):
             return False      
-        self.listStorage[name]['index'] = []
+        self.listStorage[name]['list'] = []
         self.listStorage[name]['index'] = -1
     def getCurrentIndex(self,name):
         if not self.listStorageValid(name):
@@ -103,7 +103,7 @@ class memoryManager():
         try:        
             return self.listStorage[name]['index']    
         except:
-            retrun -1
+            return -1
     def isIndexListEmpty(self, name):
         if not self.listStorageValid(name):
             return False      
diff --git a/src/fenrirscreenreader/remoteDriver/unixDriver.py b/src/fenrirscreenreader/remoteDriver/unixDriver.py
index 531f05a5..89022c10 100644
--- a/src/fenrirscreenreader/remoteDriver/unixDriver.py
+++ b/src/fenrirscreenreader/remoteDriver/unixDriver.py
@@ -33,7 +33,7 @@ class driver(remoteDriver):
             os.unlink(socketFile)
         self.fenrirSock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
         self.fenrirSock.bind(socketFile)
-        os.chmod(socketFile, 0o666)
+        os.chmod(socketFile, 0o666)  # Allow all users to read/write
         self.fenrirSock.listen(1)
         while active.value:
             # Check if the client is still connected and if data is available:
diff --git a/src/fenrirscreenreader/screenDriver/vcsaDriver.py b/src/fenrirscreenreader/screenDriver/vcsaDriver.py
index 3626f765..dcf6245e 100644
--- a/src/fenrirscreenreader/screenDriver/vcsaDriver.py
+++ b/src/fenrirscreenreader/screenDriver/vcsaDriver.py
@@ -36,7 +36,8 @@ class driver(screenDriver):
         self.hichar = None
         try:
             # set workaround for paste clipboard -> injectTextToScreen
-            os.system('sysctl dev.tty.legacy_tiocsti=1')
+            subprocess.run(['sysctl', 'dev.tty.legacy_tiocsti=1'], 
+                         check=False, capture_output=True, timeout=5)
         except:
             pass
     def initialize(self, environment):
diff --git a/src/fenrirscreenreader/soundDriver/genericDriver.py b/src/fenrirscreenreader/soundDriver/genericDriver.py
index 168a1df5..c8badc5a 100644
--- a/src/fenrirscreenreader/soundDriver/genericDriver.py
+++ b/src/fenrirscreenreader/soundDriver/genericDriver.py
@@ -44,10 +44,14 @@ class driver(soundDriver):
             return
         if interrupt:
             self.cancel()
+        # Validate file path to prevent injection
+        import os
+        if not os.path.isfile(filePath) or '..' in filePath:
+            return
         popenSoundFileCommand = shlex.split(self.soundFileCommand)
         for idx, word in enumerate(popenSoundFileCommand):
             word = word.replace('fenrirVolume', str(self.volume ))
-            word = word.replace('fenrirSoundFile', str(filePath))
+            word = word.replace('fenrirSoundFile', shlex.quote(str(filePath)))
             popenSoundFileCommand[idx] = word
         self.proc = subprocess.Popen(popenSoundFileCommand, shell=False)
         self.soundType = 'file'
diff --git a/src/fenrirscreenreader/speechDriver/genericDriver.py b/src/fenrirscreenreader/speechDriver/genericDriver.py
index 116806dd..592aefe5 100644
--- a/src/fenrirscreenreader/speechDriver/genericDriver.py
+++ b/src/fenrirscreenreader/speechDriver/genericDriver.py
@@ -174,7 +174,8 @@ class driver(speechDriver):
                 word = word.replace('fenrirVoice', str(utterance['voice']))
                 word = word.replace('fenrirPitch', str(utterance['pitch']))
                 word = word.replace('fenrirRate', str(utterance['rate']))
-                word = word.replace('fenrirText', str(utterance['text']))
+                # Properly quote text to prevent command injection
+                word = word.replace('fenrirText', shlex.quote(str(utterance['text'])))
                 popenSpeechCommand[idx] = word
 
             try: