CVE-2026-8730 — Open5GS Denial of Service

title: CVE-2026-8730 - Open5GS NRF nfInstanceId Denial of Service
id: scw-2026-05-17-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-8730 by targeting the NRF component in Open5GS. The vulnerability lies in the handling of the 'nfInstanceId' parameter within the '/nrfruntime/nrfinformation/v1/nf-instances' endpoint, which can lead to a denial of service. This rule specifically looks for POST requests to this URI with the vulnerable parameter in the query string.
author: SCW Feed Engine (AI-generated)
date: 2026-05-17
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8730/
tags:
  - attack.impact
  - attack.t1499
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/nrfruntime/nrfinformation/v1/nf-instances'
      cs-uri-query|contains:
          - 'nfInstanceId='
      cs-method:
          - 'POST'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse