CVE-2026-8063 — Null Pointer Dereference

title: CVE-2026-8063 - MongoDB Null Pointer Dereference via Empty Aggregation Pipeline
id: scw-2026-05-07-ai-1
status: experimental
level: critical
description: |
  Detects attempts to exploit CVE-2026-8063 by sending an HTTP request to the MongoDB aggregation endpoint with '$rankFusion' or '$scoreFusion' stages and an empty pipeline ('"pipeline":[]'). This specific payload triggers a null pointer dereference in affected MongoDB versions, leading to a server crash.
author: SCW Feed Engine (AI-generated)
date: 2026-05-07
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8063/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/aggregate'
      cs-uri-query|contains:
          - '$rankFusion'
      cs-uri-query|contains:
          - '$scoreFusion'
      cs-uri-query|contains:
          - '"pipeline":[]'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse