Quick Answer
Kotlin Script Runtime is a legitimate runtime library that enables Kotlin script evaluation by providing the scripting engine, compiler bridge, and runtime APIs used by Kotlin DSLs and scripting features.
Is it a Virus?
NO - Safe
Typically packaged as kotlin-script-runtime-*.jar within a legitimate Kotlin project or dependencies managed by Gradle/Maven; check the source.
Warning
Most Kotlin Script Runtime usage is benign
If you see kotlin-script-runtime in unexpected system directories or without a known project, investigate.
Can I Disable?
YES
If your project doesn't use Kotlin scripting, you can exclude the kotlin-script-runtime artifact from dependencies.
What is kotlin-script-runtime?
kotlin-script-runtime is the runtime library that enables Kotlin scripting within JVM-based applications and build tools. It provides the script engine, evaluation context, and runtime support needed to execute Kotlin scripts, DSLs, and dynamic code at both compile-time and run-time, integrating with Gradle, IntelliJ, and custom hosts.
The runtime implements Kotlin's scripting API, supplying a script compiler bridge and execution environment that lets hosts expose APIs to scripts and safely evaluate code with bindings, sandboxing, and controlled classpath access.
Quick Fact: Kotlin scripting support relies on kotlin-script-runtime to provide the execution context, bindings, and sandboxed evaluation for dynamic Kotlin code.
Types of Kotlin Script Runtime Components
- Script Engine: Executes Kotlin scripts and provides bindings to the host
- Compiler Bridge: Compiles script sources or evaluates them in real time
- Host Bindings: Allows scripts to access host project state and APIs through scripting API
- Sandbox / Security: Provides restricted execution context to limit permissions
- Classpath / Library Loading: Manages dependencies used by scripts
Is kotlin-script-runtime Safe?
Yes, kotlin-script-runtime is safe when obtained from official Kotlin distributions (JetBrains/ Kotlin distribution repositories).
Is kotlin-script-runtime a Virus or Malware?
The real runtime is NOT a virus. However, ensure it's from Kotlin/JetBrains and not a spoofed artifact.
How to Tell if kotlin-script-runtime is Legitimate or Malware
- File Location:: Must be located in: C:\Users\YourUser\.m2\repository\org\jetbrains\kotlin\kotlin-script-runtime\1.9.0\kotlin-script-runtime-1.9.0.jar
- Digital Signature:: Open the jar's Properties and check Digital Signatures. The certificate should chain to JetBrains s.r.o. If missing or signed by an unknown entity, the artifact may not be legitimate.
- Artifact Source:: Verify the dependency declaration in your build file (e.g., implementation 'org.jetbrains.kotlin:kotlin-script-runtime:1.9.0') and confirm the POM at C:\Users\YourUser\.m2\repository\org\jetbrains\kotlin\kotlin-script-runtime\1.9.0\kotlin-script-runtime-1.9.0.pom
- Behavior:: Legitimate usage loads kotlin-script-runtime only during Kotlin script evaluation within a Kotlin-enabled host (Gradle, IDE). Unexpected loading by unrelated processes is suspicious.
Red Flags: If kotlin-script-runtime.jar appears in unusual folders (e.g., C:\Windows\System32\ or AppData) or lacks a valid signature, or is loaded by non-Kotlin processes, scan with antivirus and verify the build configuration. Look for spoofed artifacts named like kotlin-script-runtime-*.jar in non-project paths.
Why Is kotlin-script-runtime Running on My PC?
kotlin-script-runtime runs when a host project invokes Kotlin scripting features or the IDE/build tools use scripts; it is loaded to compile and execute Kotlin scripts, DSLs, or dynamic configuration.
Reasons it's running:
- Active Script Execution: A host app or Gradle build script evaluates Kotlin scripts using the scripting API, causing the runtime to load.
- Gradle/Kotlin DSL Builds: Gradle uses Kotlin Script to configure builds; the runtime is loaded to compile and run these scripts.
- IDE Script Evaluation: IntelliJ IDEA or Android Studio executes Kotlin DSL scripts for project configuration, code generation, or inspections.
- REPL or Scripting Sessions: Kotlin REPL or script execution sessions bring the runtime into memory.
- Plugins and Tools: Plugins that support Kotlin scripting will load the runtime to execute dynamic extensions.
Can I Disable or Remove kotlin-script-runtime?
Yes, you can disable kotlin-script-runtime. If you don't use Kotlin scripting in your project, exclude the runtime artifact from dependencies or disable related engine in your IDE.
How to Stop kotlin-script-runtime
- Remove Script Engine usage: Remove or disable Kotlin scripting blocks in build.gradle.kts or other hosts
- Exclude from Projects: In Gradle, exclude kotlin-script-runtime from dependencies
- Disable Kotlin DSL in IDE: In IntelliJ, disable Kotlin scripting support or the Kotlin DSL plugin if not needed
- Clear caches: Invalidate caches / restart IDE
- Stop Build Tools: Disable Kotlin scripting in Gradle configuration or stop running scripts
How to Uninstall Kotlin Script Runtime
- ✔ Remove the dependency from Gradle: implementation 'org.jetbrains.kotlin:kotlin-script-runtime:1.9.0' and run a refresh
- ✔ In Maven/pom.xml, remove the kotlin-script-runtime dependency and update dependencies
- ✔ Uninstall or disable the Kotlin scripting plugin in your IDE if not needed
Common Problems: Script Errors or Performance
If kotlin-script-runtime is implicated in errors or performance issues, review common root causes and fixes related to Kotlin scripting in JVM hosts.
Common Causes & Solutions
- Unbounded script execution or infinite loops: Add time/iteration limits in script configuration and review scripts for heavy loops; consider sandboxed execution.
- Missing dependencies for scripts: Ensure kotlin-script-runtime and related Kotlin stdlib dependencies are present in the host project; sync Gradle/Maven.
- Incompatible Kotlin Script version: Align Kotlin script runtime version with the Kotlin compiler and scripting API version used by the host.
- Security restrictions in sandbox: Adjust script bindings to restrict access; avoid exposing sensitive host interfaces unless needed.
- IDE or Gradle cache corruption: Invalidate caches, refresh dependencies, and re-download kotlin-script-runtime artifacts.
- Classpath conflicts: Review duplicate kotlin-script-runtime jars and ensure a single, consistent version is used across the project.
Quick Fixes:
1. Quick Fixes:
2. 1. Check and close long-running scripts in the Kotlin Script Task Manager
3. Verify dependencies: ensure kotlin-script-runtime matches Kotlin version
4. Invalidate caches and re-sync Gradle or Maven
5. Limit script execution time and sandbox permissions
6. Review host bindings exposed to scripts
Frequently Asked Questions
What is kotlin-script-runtime?
Kotlin-script-runtime is the runtime library that supports Kotlin scripting by providing the execution engine, compiler bridge, and runtime APIs used when evaluating Kotlin scripts in JVM-based hosts.
Do I need kotlin-script-runtime to run Kotlin scripts?
Yes, if you use Kotlin scripting features or Kotlin DSLs in Gradle, IntelliJ, or other hosts, kotlin-script-runtime provides essential runtime support.
Is kotlin-script-runtime safe to use in production?
When sourced from official Kotlin distributions and used with proper bindings and sandboxing, it is safe. Always verify artifact provenance and version compatibility.
Where is kotlin-script-runtime located on disk?
Typically under your local Maven repository at C:\Users\YourUser\.m2\repository\org\jetbrains\kotlin\kotlin-script-runtime\<version>\kotlin-script-runtime-<version>.jar
Can I disable or uninstall kotlin-script-runtime?
Yes. If you don't use Kotlin scripting, remove the dependency from Gradle/Maven or disable related tooling in your IDE. You can also uninstall the Kotlin plugin if not needed.
How do I update kotlin-script-runtime?
Update your build files to use a newer version of org.jetbrains.kotlin:kotlin-script-runtime and re-sync dependencies. Ensure compatibility with your Kotlin compiler version.