CVE-2026-8746 — Open5GS Use-After-Free

title: CVE-2026-8746 - Open5GS NRF Use-After-Free Attempt
id: scw-2026-05-17-ai-1
status: experimental
level: critical
description: |
  Detects attempts to exploit CVE-2026-8746 in Open5GS by targeting the discover_handler function in the NRF component. This rule looks for specific URI paths and POST requests that are indicative of the exploit targeting a use-after-free vulnerability. The 'invalid_parameter' in the query is a placeholder for a known or suspected malformed parameter used in exploit attempts.
author: SCW Feed Engine (AI-generated)
date: 2026-05-17
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8746/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/nrfruntime/nr/context/create'
      cs-method|exact:
          - 'POST'
      cs-uri-query|contains:
          - 'invalid_parameter'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse