SnakeYaml 2.0 has been released to address an unsafe deserialization vulnerability that could lead to arbitrary code execution, a problem caused by default SnakeYaml parsing of incoming yaml to the generic object type, which creates opportunities for deserialization of other classes available on the class path. The new version mitigates this issue by only parsing standard Java classes like primitives and basic classes like string and map, requiring users to rewrite their YAML parsing logic to accommodate the changes. To fix the issue, developers must upgrade to SnakeYaml 2.x, which breaks API compatibility with earlier versions, and remove object references or use a specific tag inspector in LoaderOptions to permit only permitted yaml files that fit the object. Staying up-to-date with library versions is critical for open-source security, and using tools like Snyk Open Source can help find and fix issues or point to alternative versions.