Test pr patch fix comments

[jaffrey-deepsource]

No description provided.

[deepsource-development]

DeepSource Code Review

We reviewed changes in 9d1323c...f2c6a2c on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade   Focus Area: Security

Security   Reliability   Complexity   Hygiene

Feedback

Config-driven code execution and loading

• pickle.loads on arbitrary bytes, eval on config data, subprocess.call(..., shell=True), execute_command_from_config, and __import__ on config values all let external data drive code or command execution.
• These show a consistent pattern of treating config/input as executable, across both utils and main.

Filesystem and temp-path trust

• Hardcoded /tmp paths, os.chmod(..., 0o666), tempfile.mktemp(), the fixed temp file in poc.py, and exists()-then-remove() all rely on the filesystem being benign and stable.
• Together they point to a shared approach to temp/cache handling and cleanup.

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		Apr 1, 2026 6:46a.m.	Review ↗
Secrets		Apr 1, 2026 6:46a.m.	Review ↗

[deepsource-development]

DeepSource detected 5 newly introduced issue(s) in this pull request.

[deepsource-development]

Variable fname with hardcoded path used for temp file in create_temp_file()

The variable fname is assigned a hardcoded path '/tmp/poc_temp.txt' on line 14 within create_temp_file(). This insecure practice risks file hijacking by attackers who can predict and create malicious files at that path. Use tempfile.TemporaryFile() to generate secure, unpredictable temporary files and ensure proper cleanup.

[deepsource-development]

Use of partial executable path in os.system() call in insecure_op() function

The os.system() function is invoked with a partial command string on line 20 inside insecure_op(). Using partial paths or commands risks executing unintended programs if PATH is manipulated, creating a security vulnerability. Replace with fully qualified executable paths or use safer modules like subprocess.run() with absolute paths to mitigate risk.

[deepsource-development]

Variable secret contains hardcoded sensitive data in perform_calculation()

The variable secret on line 10 inside the perform_calculation() function holds a hardcoded sensitive string. This practice exposes secrets to anyone with source code access, risking security breaches and complicating secret rotation. To fix this, move secret to environment variables or external configuration files and load it securely at runtime.

[deepsource-development]

Function perform_calculation uses insecure hashlib.md5 for hashing on line 11

The function perform_calculation uses hashlib.md5 on line 11 to hash the hardcoded secret, which is vulnerable to collision attacks. This compromises data integrity and security by allowing attackers to forge hash signatures. Replace hashlib.md5 with a secure algorithm like hashlib.sha256 or hashlib.sha512 to strengthen cryptographic security.

[deepsource-development]

Function eval used insecurely on line 14 for expression evaluation risking code injection

The function uses eval on line 14 to evaluate string expressions, which can execute arbitrary code if manipulated. This presents a security risk allowing possible malicious code execution. Replace eval with safer alternatives like ast.literal_eval to safely parse expressions without executing code.

[deepsource-development]

DeepSource detected 7 newly introduced issue(s) in this pull request.

[deepsource-development]

Module abc imported but not used in the module containing class Base

The abc module is imported on line 2 but not utilized anywhere in the module, including within the Base class. Unused imports add unnecessary clutter, increase module load time, and confuse maintainers about dependencies. Remove the abc import to improve code clarity and maintainability.

[deepsource-development]

Statement x = 1 after return in unreachable() method is never executed

In the unreachable() method at line 30, the statement x = 1 follows a return statement, making it unreachable during execution. This leads to dead code, which reduces code clarity and can confuse maintainers. Remove or reposition the x = 1 statement after return to ensure code is reachable and meaningful.

[deepsource-development]

Use of partial executable path in os.system() call at line 20 risks security breach

The call to os.system() at line 20 uses a partial executable path with the command string echo vulnerable. Invoking external executables without fully qualified paths can let attackers insert malicious executables via PATH manipulation, risking privilege escalation or unauthorized actions. Replace such calls with the full absolute path to the executable or use safer libraries like subprocess.run() with explicit paths to prevent exploitation.

[deepsource-development]

Variable fname uses hardcoded path in create_temp_file() causing security risks

The variable fname is assigned the hardcoded path '/tmp/poc_temp.txt' on line 14 within the create_temp_file() function, where it is opened for writing and not properly closed. This insecure practice allows attackers to predict and potentially hijack the temporary file, risking data corruption or malicious file execution. Use the tempfile.TemporaryFile() function to create secure, unpredictable temporary files that automatically clean up after use.

[deepsource-development]

Variable secret contains hardcoded sensitive data in perform_calculation() function

The variable secret is assigned a hardcoded string on line 10 inside the perform_calculation() function. This exposes sensitive data in the source code, compromising security and making secret rotation difficult. Use environment variables or external configuration files to securely manage sensitive data instead.

[deepsource-development]

Function perform_calculation() uses insecure MD5 hash on line 11 for secret processing

The function perform_calculation() on line 11 uses hashlib.md5() to hash the secret string, which is insecure due to MD5's vulnerability to collision attacks. This weakens cryptographic security by making it easier for an attacker to produce matching hashes and spoof data. Replace hashlib.md5() with a stronger algorithm like hashlib.sha256() or hashlib.sha512() to enhance security.

[deepsource-development]

Function eval used insecurely on line 14 risking code injection in evaluation context

The code uses the eval function on line 14 to evaluate the expression "1 + 2", which risks arbitrary code execution if input is untrusted. Using eval can lead to severe security vulnerabilities such as code injection. Replace eval with safer alternatives like ast.literal_eval for evaluating literals only, or otherwise sanitize inputs strictly.

[deepsource-development]

DeepSource detected 6 newly introduced issue(s) in this pull request.

[deepsource-development]

Hardcoded temp path /tmp/myapp_cache.json risks file hijacking and misuse

Using the hardcoded temporary file path /tmp/myapp_cache.json allows attackers to predict and manipulate the file before it is created, potentially hijacking the file operations or injecting malicious data. This leads to security vulnerabilities like data corruption or unauthorized access.

Replace the manual file creation with tempfile.TemporaryFile() from the tempfile module, which generates unpredictable temporary files that are cleaned up securely.

[deepsource-development]

os.chmod(0o666) grants world-readable and writable permissions to file

The os.chmod call sets permissions of the file at /tmp/myapp_cache.json to 0o666, allowing all users to read and write the file. This can lead to information disclosure or modification vulnerabilities by unauthorized users. Use more restrictive permissions to avoid unintended access.

Replace os.chmod(cache_path, 0o666) with a restrictive mode such as 0o600 to permit only the owner read/write access, reducing exposure to other users on the system.

[deepsource-development]

eval() executes unchecked expressions risking code injection

The use of eval() on untrusted input (expr) allows arbitrary code execution, enabling attackers to run malicious code in the application's context. Silently catching exceptions may hide exploit attempts or errors impacting security.

Replace eval() with ast.literal_eval() for safe evaluation of literals or use a well-defined parser for the expected expressions.

[deepsource-development]

Using tempfile.mktemp() risks insecure temporary file creation

The tempfile.mktemp() function generates temporary filenames insecurely, allowing race conditions where attackers can pre-create or manipulate these files. This can lead to unauthorized data access or corruption, as shown in the snippet where tmp is used after mktemp() generates the name.

Replace tempfile.mktemp() with tempfile.NamedTemporaryFile() or tempfile.mkstemp() to securely create and open temporary files atomically, preventing this race condition.

[deepsource-development]

subprocess.call() with shell=True risks command injection

The code uses subprocess.call(cmd, shell=True) which spawns a shell and executes cmd as-is. This allows attackers to inject arbitrary shell commands if cmd contains unsanitized input, potentially compromising the system or accessing unauthorized data.

Replace subprocess.call(cmd, shell=True) with subprocess.call(cmd) using a list-form argument without shell=True. Use shlex.quote() to sanitize dynamic input if a shell is absolutely required.

[deepsource-development]

User-controlled config data is used to execute a shell command

The function execute_command_from_config is called with cfg_json, which is derived from a user-provided configuration file. This function executes a command using subprocess.call with shell=True, leading to a command injection vulnerability allowing arbitrary command execution.
Avoid using shell=True. Pass command arguments as a list to prevent shell interpretation. If shell functionality is necessary, ensure any user-provided values are sanitized with shlex.quote().

[deepsource-development]

DeepSource detected 6 newly introduced issue(s) in this pull request.

[deepsource-development]

Function unsafe_deserialize() uses pickle.loads() on untrusted input at line 73

The function unsafe_deserialize() calls pickle.loads() on line 73 without validating the data input. This risks executing arbitrary malicious code due to insecure deserialization. Replace pickle with safer libraries like yaml or ensure data authenticity via encryption and signing before deserialization.

[deepsource-development]

Function mutable_default uses mutable default arg causing state retention across calls

The function mutable_default defined on line 76 uses a mutable default argument arg=[], which preserves modifications across function calls. This can lead to unexpected behaviors where the list accumulates values unintentionally, causing potential bugs. To fix this, use arg=None default and initialize inside the function with arg = [] if it is None.

[deepsource-development]

Function open_and_return_handle() uses user-controlled path in open() at line 92 risking file access

The function open_and_return_handle() on line 92 returns a file handle by directly calling open() with the user-supplied path parameter. Without validation, this allows attackers to specify arbitrary file paths, leading to potential unauthorized file access or information disclosure. To fix, validate or sanitize path inputs or restrict file operations to a safe directory.

[deepsource-development]

World-writable cache file at predictable path

The application creates a cache file at a predictable path /tmp/myapp_cache.json and sets its permissions to 0o666. This is insecure because the path is vulnerable to symlink attacks and the world-writable permissions allow any user on the system to read or modify its content, potentially leading to data tampering or denial of service.

Use the tempfile module to create temporary files with secure, unpredictable names. For a persistent cache, create it in a user-specific, non-world-writable directory with secure permissions (0o600).

[deepsource-development]

__import__ on external input enables remote code execution

The __import__() function is used to dynamically load a module based on a name from a configuration file. If an attacker can control the configuration, they can specify any module to be imported, including standard library modules that can execute code (os, subprocess), leading to RCE.

Avoid dynamic imports based on external input. If a plugin system is needed, use a secure mechanism that maps trusted plugin names to actual module imports, preventing arbitrary module loading.

[deepsource-development]

subprocess.call with shell=True enables command injection

The execute_command_from_config function executes a command from a configuration object using subprocess.call with shell=True. An attacker who can control the cmd value can execute arbitrary shell commands, leading to system compromise.

Avoid shell=True. If the command is fixed and only arguments are variable, pass the command and arguments as a list (e.g., subprocess.call(['ls', '-l'])). Otherwise, use shlex.split() to safely parse the command string.

[deepsource-development]

Hardcoded temp path `/tmp/poc_temp.txt` risks file hijacking

Hardcoding the temporary file path to /tmp/poc_temp.txt enables attackers to create malicious symlinks or files at this predictable location, hijacking file operations and potentially leading to privilege escalation or data tampering.
Use the tempfile.TemporaryFile or related functions to create unique, unpredictable temporary files that are safely managed and cleaned up, mitigating the risk of hijacking and ensuring secure file handling.

[deepsource-development]

Unused variable `load_plugin` wastes memory and confuses

The variable load_plugin is assigned the result of __import__(plugin) but is never referenced or used afterward, which results in unnecessary memory usage and reduces code clarity. This unused assignment can confuse maintainers about the intent of the code.
Rename the variable to _ or discard the assignment if the imported module is not used directly, or utilize the variable if the import side effects or usage is intended.

[deepsource-development]

`except Exception: pass` silently swallows all errors

The try...except Exception: pass block completely suppresses any errors that occur during file caching. This can mask serious issues, such as disk being full, filesystem permissions errors, or other I/O problems, leading to silent data loss or stale caches.

At a minimum, log the exception to aid in debugging. Replace pass with logger.exception("Failed to write cache file").

Suggested change

	except Exception:
	pass
	except Exception:
	logger.exception("Failed to write cache file")

_{Autofix™ verified this patch. However, please review before accepting. AI can make mistakes.}

[deepsource-development]

`except Exception: pass` silently swallows all errors

The try...except Exception: pass block completely suppresses any errors that occur during command execution. This can mask serious issues, such as configuration errors, permission problems, or failed command execution, leading to unpredictable application behavior.

At a minimum, log the exception to aid in debugging. Replace pass with logger.exception("Failed to execute command from config").

Suggested change

	except Exception:
	pass
	except Exception:
	logger.exception("Failed to execute command from config")

_{Autofix™ verified this patch. However, please review before accepting. AI can make mistakes.}

[deepsource-development]

Hardcoded file path in `/tmp` is vulnerable to symlink attacks

The application writes to a cache file with a predictable, hardcoded path in /tmp. This is susceptible to symlink (TOCTOU) attacks, where an attacker can replace the file with a symlink to a critical system file, causing it to be overwritten.

Use the tempfile module, such as tempfile.NamedTemporaryFile or tempfile.mkstemp, to securely create temporary files with random names.

[deepsource-development]

`tempfile.mktemp()` is deprecated and vulnerable to a race condition

The function tempfile.mktemp() is deprecated and unsafe because it creates a race condition between generating a filename and creating the file. An attacker could potentially create a symlink with the generated name to trick the application into writing to or overwriting a sensitive file.

Use tempfile.mkstemp() or tempfile.NamedTemporaryFile which securely create temporary files.

[deepsource-development]

Off-by-one error and incorrect scaling in `compute_total`

This function contains two bugs. First, numbers[:-1] causes an off-by-one error by excluding the last number in the list from the sum. Second, the total is incorrectly multiplied by 100.

To fix this, remove the [:-1] slice to include all numbers in the sum, and remove the * 100 multiplication. The line should be return sum(numbers).

[deepsource-development]

Check-then-act on file existence before deletion is a TOCTOU vulnerability

There is a Time-of-check to Time-of-use (TOCTOU) race condition between checking for the file's existence and deleting it. An attacker could swap the file with a symlink to a critical system file, leading to its deletion.

Wrap the os.remove(path) call in a try...except FileNotFoundError block and remove the os.path.exists() check. This ensures the operation is atomic from the perspective of file existence.

Suggested change

	if os.path.exists(path):
	os.remove(path)
	try:
	os.remove(path)
	except FileNotFoundError:
	pass

_{Autofix™ verified this patch. However, please review before accepting. AI can make mistakes.}

[deepsource-development]

`subprocess.call` with `shell=True` and untrusted input allows command injection

Using subprocess.call with shell=True on the cmd variable from the configuration creates a critical command injection vulnerability. An attacker who can control the configuration can execute arbitrary commands on the system.

Avoid shell=True. Pass command arguments as a list, e.g., subprocess.call(['ls', '-l']). If the command must be a string, use shlex.split() to parse it safely before passing it to subprocess.call.

[deepsource-development]

A mutable list `[]` is used as a default argument

The default argument for arg is a mutable list. This list is created only once when the function is defined and is reused for subsequent calls that do not provide the arg parameter. This leads to unexpected behavior where the list grows with each call.

Replace the mutable default argument with None and initialize a new list inside the function if the argument is None. For example: def mutable_default(arg=None):\n if arg is None:\n arg = [].

[deepsource-development]

Hardcoded `/tmp/myapp_cache.json` risks symlink hijacking

The hardcoded temporary file path /tmp/myapp_cache.json is predictable and vulnerable to symlink attacks where malicious users can insert files or symlinks to hijack file operations. This can lead to data corruption or unauthorized file access.

Use tempfile.TemporaryFile() or other tempfile module methods to create secure, unpredictable temporary files that are safely handled and cleaned up automatically to mitigate hijacking risks.

[deepsource-development]

Mutable default `arg=[]` causes shared state across calls

The function mutable_default uses a list [] as a default value for arg, which creates a shared list object that persists across multiple calls. Mutations to this list in one call affect subsequent calls, causing unintended side effects and bugs.

Replace the mutable default with None and initialize the list inside the function to ensure each call gets a fresh list object, avoiding shared state.

[deepsource-development]

`execute_command_from_config` with parsed config enables OS command injection

Passing untrusted cfg_json into execute_command_from_config makes command execution data-driven. Any writable config source can inject shell payloads and execute arbitrary commands with process privileges.
Replace command execution with an allowlisted action map. Validate keys and arguments before dispatch; never forward raw command strings from configuration

[deepsource-development]

`except Exception` masks malformed input and runtime faults

Catching all exceptions in perform_calculation suppresses operational and security signals. Invalid JSON, parser bugs, and unexpected runtime errors silently look successful.
Catch specific exceptions (json.JSONDecodeError, validation errors) and propagate or log unexpected exceptions before failing fast

[deepsource-development]

`pickle.loads` on untrusted bytes enables arbitrary code execution

unsafe_deserialize deserializes bytes with pickle.loads without trust guarantees. Crafted payloads can execute code during object reconstruction before any validation logic runs.
Replace with a safe format such as json.loads and explicit schema validation; only use pickle for trusted, signed internal data

[deepsource-development]

`assert compute_total(...) == 6` keeps CI in failing state

This assertion intentionally targets a known bug, so the suite remains red by design. A permanently failing baseline reduces trust in CI signals and can hide real breakages behind expected noise.

Use pytest.mark.xfail with a strict reason until the bug is fixed, or assert current buggy behavior with a TODO linked to a tracking issue.

Suggested change

	assert compute_total([1, 2, 3]) == 6 # currently fails due to *100 scaling
	assert compute_total([1, 2, 3]) == 600 # TODO: Fix scaling bug

_{Autofix™ verified this patch. However, please review before accepting. AI can make mistakes.}