code injection example java

stackoverflow.com › questions › 1880929 › is-code-injection-possible-in-java

A java program itself is pretty much not vulnerable to code injection. However, all the native code that supports the app is vulnerable to all the different kinds of code injection - this includes the JVM and all native code parts in the app or its libraries.

Also, there are a few more things to consider:

Anything where java is used as a gateway to other systems is possible:

SQL Injection

XSS (which is in the end nothing more than JavaScript Injection)

If the java program is itself a interpreter/compiler of some kind, it might be possible to inject code into your interpreted language/compiled program (this includes using your program as a java compiler...)

And of course if you can get the java program to write a file to disk that contains code (be it native, java or something else) you might be able to get it executed by other means (which can be a different vulnerability in your app, the os or another app) - this is not direct code injection but quite similar in effect.

Answer from danielschemmel on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 1880929 › is-code-injection-possible-in-java

Is code injection possible in Java? - Stack Overflow

Videos

youtube.com

SQL Injection | Java Code Example | Episode 1

08:44

YouTube

Dependency Injection Made Simple with Java Examples | Clean Code ...

Java Dependency Injection Tutorial - YouTube

learn.snyk.io › home › security education › what is code injection? | tutorial & examples

What is code injection? | Tutorial & examples | Snyk Learn

October 28, 2025 - Having said this, occasionally code injections can still make their way into popular libraries. One pertinent example is the log4shell vulnerability. You can learn more about that here: https://learn.snyk.io/lessons/log4shell/java/

StackHawk

stackhawk.com › stackhawk, inc. › vulnerabilities and remediation › understanding and preventing command injection in java

Command Injection in Java: Examples and Prevention

January 14, 2026 - Java offers a wide range of libraries and functions that do the same task as system commands. So, you’d still be doing the same thing but not by directly executing system commands. Let’s take an example of the use-case discussed above. You have to check if a user’s directory exists, and if it does, show the files in that directory. The following code has two sections: first, where we use a library, and second, where we’re using direct system commands on the command line.

SEI CERT

wiki.sei.cmu.edu › confluence › display › java › IDS52-J.+Prevent+code+injection

IDS52-J. Prevent code injection - SEI CERT Oracle Coding Standard for Java - Confluence

dummy\'); var bw = new JavaImporter(java.io.BufferedWriter); var fw = new JavaImporter(java.io.FileWriter); with(fw) with(bw) { bwr = new BufferedWriter(new FileWriter(\"config.cfg\")); bwr.write(\"some text\"); bwr.close(); } // ; The script in this example prints "dummy" and then writes "some text" to a configuration file called config.cfg. An actual exploit can execute arbitrary code. The best defense against code injection vulnerabilities is to prevent the inclusion of executable user input in code.

Java Code Geeks

javacodegeeks.com › home › core java

Dynamic Java Code Injection - Java Code Geeks

October 19, 2015 - The obvious example is for something like a rules engine. A rules engine would want to offer the ability for users to add or change rules without having to restart the system. You could do this by injecting DSL scripts ...

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Semgrep

semgrep.dev › write rules › secure coding › java › command injection in java

Command Injection in Java | Semgrep

September 30, 2025 - By following these recommendations, you can be reasonably sure your code is free of command injection. Learn more about Command Injection vulnerability concepts. The following command runs an optimized set of rules for your project: ... The exec call executes the specified string command in a separate process. This is dangerous if a command string is controlled by user input and could result in command injection. ... // exec example Runtime.getRuntime().exec("ls -la") // Vulnerable String input = "&& cat /etc/passwd"; // value supplied by user input Runtime r = Runtime.getRuntime(); r.exec("some_tool -t param1 param2 " + input); // Vulnerable String input = "cat /etc/passwd"; // value supplied by user input Runtime.getRuntime().exec("bash", "-c", input);

GeeksforGeeks

geeksforgeeks.org › code-injection-mitigation-example

Code Injection and Mitigation with Example - GeeksforGeeks

September 29, 2022 - Many solutions have been developed ... domain. Some examples include input validation, parameterization, privilege setting for different actions, addition of extra layer of protection and others....

DigitalOcean

digitalocean.com › community › tutorials › java-dependency-injection-design-pattern-example-tutorial

Java Dependency Injection: Design Pattern Tutorial | DigitalOcean

August 3, 2022 - So dependency injection implementation solved the problem with hard-coded dependency and helped us in making our application flexible and easy to extend. Now let’s see how easily we can test our application class by mocking the injector and service classes. package com.journaldev.java.dependencyinjection.test; import org.junit.After; import org.junit.Before; import org.junit.Test; import com.journaldev.java.dependencyinjection.consumer.Consumer; import com.journaldev.java.dependencyinjection.consumer.MyDIApplication; import com.journaldev.java.dependencyinjection.injector.MessageServiceInjec

SecureFlag

knowledge-base.secureflag.com › vulnerabilities › code_injection › os_command_injection_java.html

OS Command Injection in Java | SecureFlag Security Knowledge Base

August 5, 2025 - import java.io.File; public static void listFiles(String[] args) throws Exception { File dir = new File(System.getProperty("dir")); if (!dir.isDirectory()) { System.out.println("Not a directory"); } else { for (String file : dir.list()) { System.out.println(file); } } } Mitre - CWE-78: Improper Neutralization of Special Elements used in an OS Command OWASP - Command Injection IDS07-J.

CodeJava

codejava.net › coding › what-is-dependency-injection-with-java-code-example

What is Dependency Injection with Java Code Example

Spring Dependency Injection Example with Java Config · How to implement forgot password feature for Java web application · How to implement remember password (remember me) for Java web application · How to code login and logout with Java Servlet, JSP and MySQL

Sololearn

sololearn.com › en › Discuss › 1072834 › wanted-codeinjection-in-java

(Wanted) Code-Injection in Java | Sololearn: Learn to code for FREE!

If you Want to implement that: ... Case in Java. so you need to think carefully If you Want to Change that, usually These Things are there for a reason. ... Well, when I have a Textinput and I perform a SQL-thing with it (and it is done bad) I can do a code Injection like: "" OR ...

GitHub

gist.github.com › superblaubeere27 › cffe74faf3545c760f7d5d198403424c

Code injection with Java Agents · GitHub

Java Agents are used to replace code when the application is running. When you are debugging with IntelliJ, Eclipse etc. and you saving / rebuilding your code, an agent will be loaded to do it. The environment has to be a Java Development Kit (not a Java Runtime Enviroment) to inject the code at runtime.

reddit.com › r/java › code injection in java

r/java on Reddit: Code injection in Java

March 3, 2017 -

This is something that I think is super interesting. How exactly does it modify a class within a game, let's say? How does the fact that it's communicating with a server affect the efficacy? How do games stop injection? From what I understand, cheat engine is a form of it.

Can anyone point me towards some good resources or give any info? Not sure if this is the right place, so if anyone's got any other places that may be better let me know!

Top answer

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The most effective way to change classes on load would be at the JVM level since it controls the virtual machine. There exist libraries and such which can do this quite easily. This is the most powerful option. Otherwise, you will need to modify classes as they are stored on the disk or use some kind of alternative class loader. You cannot stop injection at all. You can pretty much write a virtual machine which runs whatever software you choose and modify it in the layer above the virtualized machine.

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If you have access to .class file, you can just inject whatever you want in to it. It's going to be run by JVM, fs long as, your modified .class file has valid bytecode. You can use ASM to play with byte code. You also can modify classes at runtime with Java Instrumentation API. ASM or Javaassist can also help here. How do games stop injection? Code signing?

Semgrep

semgrep.dev › write rules › secure coding › java › code injection in java

Code Injection in Java | Semgrep

For example, broken authentication that results in access to private data, or otherwise allow the attacker to obtain control of application behavior causing the application to behave in an unexpected manner.

SonarSource

rules.sonarsource.com › java › tag › injection

Java static code analysis | injection - Rules Sonarsource

Unique rules to find Bugs, Vulnerabilities, Security Hotspots, and Code Smells in your JAVA code

Semgrep

semgrep.dev › learning guides › application security › vulnerabilities › code injection

Code Injection | Semgrep

One common form of code injection involves dynamic evaluation of input. Developers sometimes reach for this approach when they want to quickly process user-provided data. Even if you didn’t write any code yourself that allows for dynamic ...

DZone

dzone.com › software design and architecture › security › code injection – examples and prevention

Code Injection – Examples and Prevention

November 21, 2021 - It is relatively easy to insert and use one’s own Javascript code on a website either by finding a cross-site scripting vulnerability or by including code in the address bar. While it is often used in the developer’s console as a debugging mechanism, attackers can utilize Javascript injection ...

Vogella

vogella.com › tutorials › DependencyInjection › article.html

Using dependency injection in Java - Introduction - Tutorial

Using this analysis, it can create an instance of the class and inject the required objects into the class’s defined dependencies using Java reflection. By avoiding hard dependencies, a Java class is decoupled from specific implementations, making it easier to test. For example, such a class can be tested in isolation using mock objects.

Mend

mend.io › blog › developer › how to use dependency injection in java: tutorial with examples

How To Use Dependency Injection In Java: Tutorial With Examples

October 31, 2024 - Learn how to use Dependency Injection in Java with this comprehensive tutorial. Discover its benefits, types, and practical examples.