Executive Summary

CVE-2026-3329 is a security vulnerability in Sonatype Nexus Repository versions 3.0.0 through 3.92.x that allows a remote unauthenticated attacker to perform credential-guessing attacks against user accounts via authentication endpoints.

This means an attacker can try many username and password combinations remotely without needing to be logged in, attempting to gain unauthorized access.

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Impact Analysis

If exploited successfully, an attacker could gain unauthorized access to the Sonatype Nexus Repository.

This unauthorized access could lead to the disclosure of sensitive artifacts or configuration data stored in the repository.

Such a breach could compromise the integrity and confidentiality of your software supply chain and internal development processes.

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Detection Guidance

This vulnerability can be detected by monitoring authentication logs for unusual activity that may indicate credential-guessing attacks against user accounts via authentication endpoints.

Specifically, you should look for repeated failed login attempts or abnormal authentication patterns in the Sonatype Nexus Repository logs.

While no specific commands are provided in the available resources, typical approaches include using log analysis tools or commands such as 'grep' to search for failed login attempts in the Nexus Repository authentication logs.

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Mitigation Strategies

Immediate mitigation steps include upgrading Sonatype Nexus Repository to version 3.93.0 or later, where the vulnerability has been fixed.

• Restrict network access to the Nexus Repository to limit exposure.
• Deploy a reverse proxy or Web Application Firewall (WAF) with rate limiting to prevent credential-guessing attacks.
• Enable Single Sign-On (SSO) to reduce reliance on direct authentication endpoints.
• Monitor authentication logs for unusual activity to detect potential attacks early.

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