CVE-2026-17597 Sonatype CVE debrief

Who should care

Organizations using Nexus Repository 3 CE/Pro versions up to and including 3.94.1 should be aware of this SSRF vulnerability and take steps to mitigate it. This includes upgrading to version 3.95.0 or later, restricting access to the email configuration verification feature, and monitoring for suspicious network activity. Security teams and vulnerability management teams should prioritize this vulnerability and ensure that affected systems are remediated as soon as possible. Additionally, operators and administrators of Nexus Repository 3 should review the email configuration verification feature and ensure that it is properly configured to prevent SSRF attacks. This may involve reviewing and updating access controls, monitoring for suspicious activity, and implementing compensating controls as needed. By taking these steps, organizations can help prevent exploitation of this vulnerability and reduce the risk of a security breach. IT and development teams may also need to coordinate to apply patches and ensure that systems are up to date. Effective communication and coordination between teams is crucial to ensure timely remediation of this vulnerability. The vulnerability management team should track the remediation progress and verify that all affected systems have been updated or mitigated. They should also review and update incident response plans to include procedures for responding to potential SSRF attacks. By prioritizing this vulnerability and taking proactive steps to mitigate it, organizations can help protect their systems and data from potential attacks. The security team should also review and update security policies and procedures to include guidance on configuring and using the email configuration verification feature securely. This may involve updating security policies to require the use of secure protocols for email verification and restricting access to the feature to only those who need it. By taking a proactive and multi-faceted approach to mitigating this vulnerability, organizations can help reduce the risk of a security breach and protect their systems and data. The IT team should also review and update system logs and monitoring to help

Technical summary

The CVE-2026-17597 vulnerability is a Server-Side Request Forgery (SSRF) issue in the email configuration verification feature of Nexus Repository 3. An attacker with the nexus:settings:update permission can submit arbitrary host and port values to the email test/verification endpoint, potentially allowing them to infer whether internal hosts and ports are reachable. This issue affects Nexus Repository 3 CE/Pro versions up to and including 3.94.1 and is fixed in version 3.95.0. The vulnerability can be mitigated by upgrading to the latest version, restricting access to the email configuration verification feature, and monitoring for suspicious network activity.

Defensive priority

Organizations using Nexus Repository 3 CE/Pro versions up to and including 3.94.1 should prioritize upgrading to version 3.95.0 to mitigate the SSRF vulnerability.

Recommended defensive actions

• Upgrade to Nexus Repository 3 version 3.95.0 or later
• Restrict access to the email configuration verification feature
• Monitor for suspicious network activity
• Review and update incident response plans to include procedures for responding to potential SSRF attacks
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE description indicates that Nexus Repository 3 contains a Server-Side Request Forgery (SSRF) vulnerability in the email configuration verification feature. A user with the nexus:settings:update permission could submit arbitrary host and port values to the email test/verification endpoint, causing the server to attempt outbound network connections to internal or restricted network addresses. The issue affects Nexus Repository 3 CE/Pro versions up to and including 3.94.1 and is fixed in version 3.95.0.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.