CVE-2026-7518 — Open5GS Denial of Service

title: CVE-2026-7518 - Open5GS AMF SBI Endpoint DoS
id: scw-2026-05-01-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-7518 by targeting the Open5GS AMF SBI Endpoint. This rule specifically looks for POST requests to the '/namf-callback/v1/{id}/sdmsubscription-notify' endpoint containing the 'changeItem.newValue' parameter in the query string, which is indicative of the denial of service vulnerability.
author: SCW Feed Engine (AI-generated)
date: 2026-05-01
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-7518/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/namf-callback/v1/'
      cs-method:
          - 'POST'
      cs-uri-query|contains:
          - 'changeItem.newValue'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse