CVE-2026-30063

Deferred Deferred - Pending Action

NF Discovery DoS in free5gc v4.0.1

Publication date: 2026-08-27

Last updated on: 2026-08-31

Assigner: MITRE

Description

An issue in the NF Discovery endpoint of free5gc v4.0.1 allows attackers to cause a Denial of Service (DoS) via a crafted snssais query.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-27

Last Modified

2026-08-31

Generated

2026-09-17

AI Q&A

2026-08-27

EPSS Evaluated

2026-09-15

NVD

CVE-2026-30063

EUVD

EUVD-2026-67113

Affected Vendors & Products

Vendor	Product	Version / Range
free5gc	free5gc	4.0.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-770	The product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.

Attack-Flow Graph

Executive Summary

This vulnerability is a denial-of-service (DoS) issue in free5GC's Network Repository Function (NRF) component. It occurs when the snssais query parameter in the NF Discovery endpoint is left empty, causing a runtime panic due to an out-of-bounds slice operation in the nf_discovery.go file. This leads to a server crash and a 500 Internal Server Error.

Detection Guidance

To detect this vulnerability, send a crafted request with an empty snssais parameter to the NF Discovery endpoint. Example command: curl -v "http://<target-ip>:8000/nnrf-disc/v1/nf-instances?target-nf-type=AMF&requester-nf-type=AMF&snssais=". A successful detection results in a 500 Internal Server Error response.

Impact Analysis

This vulnerability can disrupt service availability by crashing the free5GC server when an attacker sends a crafted request with an empty snssais parameter. This results in a 500 Internal Server Error, making the service unavailable until manually restarted.

Compliance Impact

This vulnerability could indirectly impact compliance with standards like GDPR or HIPAA by disrupting service availability. A DoS condition may lead to unauthorized data access or processing delays, potentially violating availability requirements in these regulations.

Mitigation Strategies

Apply a patch to validate the snssais parameter in the nf_discovery.go file before processing. Ensure the server returns a 400 Bad Request for empty or invalid values instead of crashing. Update to a fixed version of free5GC if available.

Hi! I’m here to help you understand CVE-2026-30063. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70