CVE-2026-8251 — Open5GS Denial of Service

title: CVE-2026-8251 - Open5GS SMF Denial of Service Attempt
id: scw-2026-05-10-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-8251 in Open5GS by targeting the update_authorized_pcc_rule_and_qos function within the SMF component. This rule looks for specific HTTP POST requests to the SMF endpoint that include the vulnerable function in the query parameters, resulting in a server error (500 status code), indicative of a denial of service attempt.
author: SCW Feed Engine (AI-generated)
date: 2026-05-10
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8251/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri:
          - '/smf/v1/nr-ue-context-management/ue-contexts'
      cs-method:
          - 'POST'
      cs-uri-query|contains:
          - 'update_authorized_pcc_rule_and_qos'
  selection_base:
      sc-status:
          - '500'
  condition: selection AND selection_base
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse