CVE-2026-8729 — Open5GS Denial of Service

title: CVE-2026-8729 - Open5GS NRF Denial of Service via Malformed Service-Names Argument
id: scw-2026-05-17-ai-1
status: experimental
level: high
description: |
  This rule detects attempts to exploit CVE-2026-8729 in Open5GS. The vulnerability lies in the NRF component and is triggered by manipulating the 'service-names/snssais' argument in a request, leading to a denial of service. This detection specifically looks for requests targeting '/service-names' with a query parameter containing 'snssais='.
author: SCW Feed Engine (AI-generated)
date: 2026-05-17
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8729/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/service-names'
      cs-uri-query|contains:
          - 'snssais='
      cs-method|exact:
          - 'GET'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse