CVE-2026-7583 — Open5GS Denial of Service

title: CVE-2026-7583 - Open5GS BSF Denial of Service via IPv6 Prefix Manipulation
id: scw-2026-05-01-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-7583 in Open5GS by targeting the bsf_sess_find_by_ipv6prefix function. The rule looks for HTTP POST requests to a URI containing '/bsf/context.c' and a query parameter 'ipv6Prefix', indicating a potential manipulation of the IPv6 prefix argument to cause a denial of service.
author: SCW Feed Engine (AI-generated)
date: 2026-05-01
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-7583/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/bsf/context.c'
      cs-uri-query|contains:
          - 'ipv6Prefix='
      cs-method:
          - 'POST'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse