CVE-2026-30058 free5gc CVE debrief

Who should care

Organizations using free5gc v4.0.1, particularly those with deployments in managed environments, should be aware of this vulnerability and take steps to mitigate it. This includes verifying inventory, applying vendor remediation if available, and monitoring for crafted input attempts. Security teams and vulnerability management teams should review the official advisory and CVE record to validate affected scope, severity, and vendor guidance. Additionally, defenders should review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant monitoring, detection, and logs for exposed assets that need extra review. IT operations teams responsible for free5gc v4.0.1 installations should prioritize patching or mitigating this vulnerability to prevent potential Denial of Service (DoS) attacks. Compliance and risk management teams should ensure that appropriate measures are taken to address this vulnerability in accordance with organizational policies and regulatory requirements. Penetration testers and red teamers may also want to consider this vulnerability when assessing the security posture of organizations using free5gc v4.0.1. Finally, researchers should note the limited information available and the need for further analysis to fully understand the vulnerability's impact and potential mitigations. Managed Security Service Providers (MSSPs) and incident response teams should be prepared to respond to potential exploitation attempts and have plans in place for rapid remediation. Network administrators and security engineers should review network configurations and implement additional monitoring or controls as needed to detect and prevent exploitation attempts. This vulnerability affects a widely used open-source 5G core network component, making it a critical concern for telecommunications providers, cloud service providers, and enterprises with 5G infrastructure. The vulnerability's impact on service availability could be significant, making prompt assessment and mitigation crucial for maintaining service reliability and security. The lack of detailed information about the vulnerability's exploitation requires a more

Technical summary

The HTTPModifySubscription handler in free5gc v4.0.1 does not properly validate input, allowing an attacker to cause a Denial of Service (DoS) via a crafted input. This vulnerability is classified as Improper Input Validation. Organizations using free5gc v4.0.1 should verify their inventory and apply vendor remediation if available.

Defensive priority

Organizations using free5gc v4.0.1 should verify their inventory and apply vendor remediation if available.

Recommended defensive actions

• Verify inventory of free5gc v4.0.1 installations
• Apply vendor remediation if available
• Monitor for crafted input attempts

Evidence notes

The CVE record indicates Improper Input Validation in the HTTPModifySubscription handler of free5gc v4.0.1, which allows attackers to cause a Denial of Service (DoS) via a crafted input. The NVD entry is currently Deferred.

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.