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Summary
Generic Semgrep rule for Jenkins/Java plugins that construct a
URLClassLoaderfrom a URL list.In Jenkins,
Builder/SimpleBuildStep.perform()runs on the controller JVM. Loading JARs discovered from a job-configured filesystem path vianew URLClassLoader(...)is controller-side arbitrary code execution. Empty URL arrays are excluded.Rule
codevigilant.java.jenkins.classloader.path-to-urlclassloaderjava/jenkins/classloader/path-to-urlclassloader.yamlnew URLClassLoader(...)new URLClassLoader(new URL[]{})andnew URLClassLoader(new URL[0])Test
new URLClassLoader(urls)firessemgrep --validate --config java/clean