Vulnerability Description
free5GC is an open source 5G core network. free5GC NRF prior to version 1.4.2 has an Improper Input Validation vulnerability leading to Denial of Service. All deployments of free5GC using the NRF discovery service are affected. The `EncodeGroupId` function attempts to access array indices [0], [1], [2] without validating the length of the split data. When the parameter contains insufficient separator characters, the code panics with "index out of range". A remote attacker can cause the NRF service to panic and crash by sending a crafted HTTP GET request with a malformed `group-id-list` parameter. This results in complete denial of service for the NRF discovery service. free5GC NRF version 1.4.2 fixes the issue. There is no direct workaround at the application level. The recommendation is to apply the provided patch or restrict access to the NRF API to trusted sources only.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Free5Gc | Free5Gc | < 1.4.2 |
Related Weaknesses (CWE)
References
- https://github.com/free5gc/free5gc/issues/777Issue TrackingExploit
- https://github.com/free5gc/free5gc/security/advisories/GHSA-7c47-xr7q-p6hgVendor Advisory
- https://github.com/free5gc/nrf/commit/dac77d8f8f2e0f041c5634fb3c685dcb9734b872Patch
- https://github.com/free5gc/nrf/pull/80Patch
FAQ
What is CVE-2026-33062?
CVE-2026-33062 is a vulnerability with a CVSS score of 7.5 (HIGH). free5GC is an open source 5G core network. free5GC NRF prior to version 1.4.2 has an Improper Input Validation vulnerability leading to Denial of Service. All deployments of free5GC using the NRF disc...
How severe is CVE-2026-33062?
CVE-2026-33062 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-33062?
Check the references section above for vendor advisories and patch information. Affected products include: Free5Gc Free5Gc.