Managing security vulnerabilities in Spring Boot is crucial for creating strong and secure applications. Software composition analysis (SCA) tools like Snyk Open Source can help developers find vulnerabilities in their dependencies, such as the `netty-codec-http2` and `snakeyaml` packages. Updating the Webflux starter to a higher version or updating the parent Spring Boot version is recommended for fixing high-severity security issues. For transitive dependencies, using version properties in the Spring Boot configuration files or dependency management mechanisms in Maven or Gradle can help update specific dependencies. Regularly scanning your codebase with Snyk is essential for identifying and addressing security issues, reducing the risk of data breaches and other security incidents.