CVE-2026-6666 — A possible null pointer reference in PgBouncer before

title: CVE-2026-6666 - PgBouncer Null Pointer Dereference Crash Attempt
id: scw-2026-05-09-ai-1
status: experimental
level: high
description: |
  This rule detects attempts to exploit CVE-2026-6666 in PgBouncer. The vulnerability is triggered when a server sends an error response without an SQLSTATE field, leading to a null pointer dereference and a crash. This rule looks for web server requests targeting a PgBouncer endpoint (assuming a common path) that result in a 500 Internal Server Error, which could indicate the server is attempting to exploit this vulnerability. This is a critical detection for initial access via a vulnerable PgBouncer instance.
author: SCW Feed Engine (AI-generated)
date: 2026-05-09
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-6666/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/pgbouncer'
      cs-method|exact:
          - 'POST'
      sc-status|exact:
          - '500'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse