How to Quickly Fix the Log4j2 Vulnerability in Spring Boot

Many developers were overwhelmed by the epic Log4j2 vulnerability that surfaced yesterday, with large groups scrambling for solutions.

Fortunately, mitigation measures and official fixes were released quickly, and the Log4j2 team published a new patched version, allowing applications to apply a stable fix.

Simplest Fix for Spring Boot Users

Some developers tried to address the issue by requesting that spring-boot-starter-log4j2 support the latest 2.15 version, but you don’t need a special release. Adding a simple configuration to your pom.xml is enough.

Just include the following property:

<properties>
    <log4j2.version>2.15.0</log4j2.version>
</properties>

If you are learning Spring Boot, consider following a long‑running free tutorial series.

Afterword

Recent vulnerabilities affecting Spring Boot applications often involve third‑party components rather than the default ones. For example, Log4j2 is not the default logging framework; Spring Boot uses Logback by default, so many developers were merely watching the drama.

Previously, serious issues were frequently caused by Fastjson , another third‑party library. Spring Boot defaults to Jackson for JSON serialization, but Fastjson became popular for perceived performance gains.

Our recommendation is to stick with the default components unless you have specific performance requirements or functionality that cannot be achieved otherwise, as the default ecosystem is more battle‑tested and stable.

Feel free to share which Spring Boot default components you have replaced in the comments.