Nexus Repository and CVE-2026-0600: why proxy configuration becomes an attack surface

> TL;DR: CVE-2026-0600 affects Nexus Repository 3 through SSRF in proxy repository configuration. Here is why this is critical for supply-chain teams.

A recent flaw in a key supply-chain component

Sonatype documents CVE-2026-0600 as SSRF in the proxy repository configuration of Nexus Repository 3. According to the official advisory, an authenticated administrator can configure a remote storage URL that causes the server to make requests to unintended network destinations, including cloud metadata services and internal networks, when users access artifacts through that repository.

Why this is critical

Nexus is often treated as a convenience layer for packages and artifacts. In reality, it is a central supply-chain control point. SSRF in this class of system can open pivot paths into internal services that were never meant to be reachable.

What this says about supply-chain risk

Security around internal repositories is not only about signatures, dependencies, or publish rights. The product network behavior itself is part of the risk surface.

Our view

CVE-2026-0600 is a strong example of a modern supply-chain tooling flaw: it does not directly target source code, but the infrastructure that stores and relays trusted artifacts. In many organizations, that alone makes it a priority issue.

Key Takeaways