Introduction

The short answer is that newer Spring Boot lines do use SnakeYAML 2.x, but not all “new” Spring Boot versions do, and the managed version is not necessarily exactly 2.0. The real answer depends on which Spring Boot release line you mean.

The Important Version Boundary

Spring Boot manages dependency versions through its BOM. That means the right way to answer the question is to check the spring-boot-dependencies version for the Boot line you are using.

From the official Spring Boot dependency definitions:

• Spring Boot 3.0.0 manages SnakeYAML 1.33
• Spring Boot 3.1.0 still manages SnakeYAML 1.33
• Spring Boot 3.2.0 moves to SnakeYAML 2.2
• Spring Boot 3.4.0 manages SnakeYAML 2.3
• Spring Boot 3.5.0 manages SnakeYAML 2.4

So the accurate statement is not “Spring Boot added exactly SnakeYAML 2.0.” The accurate statement is that Spring Boot moved into the SnakeYAML 2.x line starting with Boot 3.2.

Why This Matters

SnakeYAML version changes are not cosmetic. They can affect:

• security posture
• parser behavior
• API compatibility in direct SnakeYAML usage
• transitive dependency resolution in builds

If your application only uses application.yml through Spring Boot, the upgrade may be invisible. If your code imports SnakeYAML classes directly, the version line matters much more.

How to Check the Version in Your Own Project

If you use Maven, inspect the effective dependency tree:

mvn dependency:tree | grep snakeyaml

If you use Gradle:

./gradlew dependencies --configuration runtimeClasspath | grep snakeyaml

That confirms the actual resolved version instead of relying on memory or forum posts.

What If You Need a Different Version

You can override Boot's managed version, but do it carefully. Overriding transitive dependencies means you are taking responsibility for compatibility.

A Maven example:

<properties>
    <snakeyaml.version>2.4</snakeyaml.version>
</properties>

Or an explicit dependency override:

1<dependency>
2    <groupId>org.yaml</groupId>
3    <artifactId>snakeyaml</artifactId>
4    <version>2.4</version>
5</dependency>

That may be reasonable for a targeted security update, but it should be tested rather than assumed safe.

If you are upgrading specifically because of a CVE advisory, check whether a newer Spring Boot maintenance release already manages the safer SnakeYAML line for you. In many cases, upgrading the Boot patch or minor line is cleaner than pinning a one-off dependency override that drifts away from the tested BOM.

Direct Use Versus Boot-Managed Use

Many Spring Boot applications never touch SnakeYAML directly. They just rely on Boot to parse configuration files such as application.yml.

In that situation, the practical question is usually “which version does Boot manage for me?” not “which version did I manually add?”

If you directly instantiate SnakeYAML classes in your code, then you should read both the Spring Boot release notes and the SnakeYAML migration implications before changing versions.

Common Pitfalls

A common mistake is saying “new Spring Boot versions use SnakeYAML 2.0” as if that applied uniformly across every recent release. It does not.

Another mistake is assuming that because Boot has moved to SnakeYAML 2.x, any manual override to any other 2.x version is automatically safe. Managed versions are tested together for a reason.

A third issue is checking only the pom.xml and forgetting that the resolved dependency may still come from Boot's BOM or another override in the build.

Summary

• Spring Boot did not jump universally to exactly SnakeYAML 2.0
• Boot 3.0 and 3.1 managed SnakeYAML 1.33
• Boot 3.2 and later moved into the SnakeYAML 2.x line
• Check the resolved dependency in your own build instead of guessing
• Override Boot-managed versions only when you have a clear reason and a compatibility test plan