diff --git a/libfuzzer/run_corpus.py b/libfuzzer/run_corpus.py
index fc76cea0..04e06fe7 100644
--- a/libfuzzer/run_corpus.py
+++ b/libfuzzer/run_corpus.py
@@ -8,6 +8,14 @@
 import os
 import argparse
 import subprocess
+import shlex
+
+# Maximum size limits in bytes (1MB)
+MAX_INSTRUCTIONS_SIZE = 1024 * 1024
+MAX_MEMORY_SIZE = 1024 * 1024
+
+# Timeout for plugin execution in seconds
+PLUGIN_TIMEOUT = 30
 
 def parse_plugin_options(options_str: str) -> str | list[str]:
     """Parse plugin options string into either a single string or list of options."""
@@ -20,7 +28,6 @@ def parse_plugin_options(options_str: str) -> str | list[str]:
             # Remove outer quotes and handle escaped quotes
             return options_str[1:-1].replace(f"\\{quote}", quote)
     # Split by spaces, preserving quoted substrings
-    import shlex
     return shlex.split(options_str)
 
 def parse_corpus_file(corpus_file: str) -> tuple[bytes, bytes]:
@@ -32,14 +39,14 @@ def parse_corpus_file(corpus_file: str) -> tuple[bytes, bytes]:
                 print(f'Invalid file format (header too short): {corpus_file}')
                 return None, None
             instructions_length = int.from_bytes(header, byteorder='little')
-            if instructions_length <= 0 or instructions_length > 1024*1024:  # 1MB limit
+            if instructions_length <= 0 or instructions_length > MAX_INSTRUCTIONS_SIZE:
                 print(f'Invalid instructions length: {instructions_length}')
                 return None, None
             instructions = f.read(instructions_length)
             if len(instructions) != instructions_length:
                 print(f'Truncated instructions in file: {corpus_file}')
                 return None, None
-            memory = f.read(1024*1024)  # Read max 1MB of memory
+            memory = f.read(MAX_INSTRUCTIONS_SIZE)
             return instructions, memory
     except IOError as e:
         print(f'Error reading file {corpus_file}: {e}')
@@ -57,7 +64,7 @@ def run_plugin(plugin_path: str, memory_hex: str, options: str | list[str],
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE)
-        output, stderr = process.communicate(input=instructions, timeout=30)
+        output, stderr = process.communicate(input=instructions, timeout=PLUGIN_TIMEOUT)
         if process.returncode != 0:
             return None, f'Plugin failed with error: {stderr.decode()}'
         return output, None