What’s a secure, low-vulnerability base image for Java 17?

Hardened Java images from vendors such as Red Hat, Chainguard, or BellSoft are worth evaluating if you need a supported update cadence and non-root or musl/glibc variants. Alpine can be small, but musl compatibility may matter for applications using native libraries. Whatever image you choose, rebuild frequently so newly disclosed operating-system and Java fixes are incorporated.

Distroless Java images are a good option if your application does not need a shell or package manager. They remove many OS utilities and packages, which reduces the attack surface and usually produces fewer findings. Make sure your logging, debugging, certificates, timezone data, and native-library requirements work with the more minimal environment.

If you control the application build, creating a custom runtime with jlink is another route. Include only the Java modules your application needs and start from a minimal or distroless base. This can reduce size and attack surface, but it adds maintenance and testing work, so it is not always worth doing just to lower a scanner count.

Buildpacks or Jib can create optimized, layered Java images and make it easier to update the operating-system layers independently from the application. They are not automatically vulnerability-free, though—the underlying builder and runtime still need to be trusted and regularly updated. The main benefit is repeatable builds and simpler rebasing, not a guarantee of security.

Before switching images, triage the scan results. Many findings in the Ubuntu-based images belong to system packages that a Java process cannot reach, and scanners can report theoretical issues that are not exploitable in your application. Keep the image updated, scan your application dependencies too, and prioritize reachable, high-severity vulnerabilities rather than simply targeting a zero-CVE report.