# CVE-2026-30073: free5gc NSSF nil pointer dereference in NssaiAvailabilitySubscriptionCreate

Source: https://junglewise.ai/threats/cve-2026-30073-free5gc-nssf-nil-pointer-dereference-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-27. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-30073 · Severity: high · CVSS 7.5 · Published 2026-08-27

free5gc is an open-source 5G core network implementation used to test and develop 5G infrastructure. A flaw in the NSSF (Network Slice Selection Function) component allows an attacker to crash the service with a single malformed HTTP request, causing complete service unavailability. This disrupts 5G network slice management and can affect all connected devices.

Technologies: [free5GC](https://junglewise.ai/threats/technologies/free5gc). Vendors: [free5GC](https://junglewise.ai/threats/vendors/free5gc).

## Quick answers

**Is CVE-2026-30073 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-30073 being exploited in the wild.

**How severe is CVE-2026-30073?** High severity, with a CVSS score of 7.5, published 27 August 2026.

**Which products and versions are affected?** free5GC v4.0.1.

**Is there a fix for CVE-2026-30073?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-30073 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-30073?** Check whether you run free5GC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The NssaiAvailabilitySubscriptionCreate request handler in free5gc v4.0.1 contains a nil pointer dereference vulnerability. The handler accesses and mutates a shared global configuration object (factory.NssfConfig.Subscriptions) without initializing it or implementing synchronization, causing a panic when dereferencing uninitialized pointers, maps, or slices. An unauthenticated attacker can trigger this by sending a crafted POST request to the /nnssf-nssaiavailability/v1/nssai-availability/subscriptions endpoint, resulting in a runtime panic (HTTP 500) and immediate service crash. The attack requires no authentication and only network reachability to the NSSF service. A patch or upstream fix is required to add proper initialization and synchronization to the shared state access.

## Affected products

- free5gc free5gc v4.0.1

## Timeline

- 2026-01-01: disclosed: Vulnerability reported via GitHub issue #764
- 2026-08-27: advisory: CVE-2026-30073 published

## References

- [https://github.com/free5gc/free5gc/issues/764](https://github.com/free5gc/free5gc/issues/764)

## Related threats

- [Free5GC SMF resource exhaustion in PFCP session establishment](https://junglewise.ai/threats/cve-2026-106805-a-resource-exhaustion-issue-exists-in-free5gc-v4-2-3-during-pfcp)
- [Free5GC race condition in GMM handler RanUe context access](https://junglewise.ai/threats/cve-2026-94043-a-vulnerability-was-determined-in-free5gc-up-to-4-2-3-this)
- [Free5GC UPF nil pointer dereference in PFCP Session Report](https://junglewise.ai/threats/cve-2026-75439-free5gc-upf-nil-pointer-dereference-in-pfcp-session-report)
- [free5GC NRF input validation bypass in NF profile registration](https://junglewise.ai/threats/cve-2026-55068-free5gc-nrf-input-validation-bypass-in-nf-profile-registration)
- [free5gc RechargePut denial of service in input parsing](https://junglewise.ai/threats/cve-2026-30071-free5gc-rechargeput-denial-of-service-in-input-parsing)