CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

┌──────────────────────┐
│   PostgreSQL User    │
│  REPLICATION = YES   │
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│   Logical Decoding   │
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│ Missing Authorization│
│      Validation      │
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│   Library Loading    │
└──────────┬───────────┘
           │
           ▼
┌──────────────────────┐
│ PostgreSQL OS User   │
└──────────────────────┘

SELECT
    version() AS postgres_version,
    current_user AS current_user,
    rolsuper AS is_superuser,
    rolreplication AS has_replication
FROM pg_roles
WHERE rolname = current_user;

postgres_version : PostgreSQL 17.x
current_user     : security_audit
is_superuser     : f
has_replication  : t

              ┌───────────────┐
              │ PostgreSQL    │
              │ Connection    │
              └───────┬───────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Get Server      │
             │ Version         │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Check Current   │
             │ Role            │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Check           │
             │ REPLICATION     │
             └────────┬────────┘
                      │
                      ▼
             ┌─────────────────┐
             │ Compare Against │
             │ Fixed Releases  │
             └────────┬────────┘
                      │
              ┌───────┴────────┐
              ▼                ▼
        Potentially          Not
        Vulnerable         Affected

❌ Load an attacker-controlled .so
❌ Execute arbitrary SQL payloads
❌ Execute operating-system commands
❌ Spawn a reverse shell
❌ Modify PostgreSQL configuration
❌ Modify filesystem contents
❌ Create persistence
❌ Exploit production systems

git clone https://github.com/<YOUR-USERNAME>/CVE-2026-6471.git
cd CVE-2026-6471

python3 -m pip install psycopg2-binary

python3 CVE-2026-6471.py

╔════════════════════════════════════════════════════╗
║             CVE-2026-6471 SAFE CHECK               ║
║       PostgreSQL Logical Decoding Audit            ║
╚════════════════════════════════════════════════════╝

[+] Connecting to PostgreSQL...
[+] Server version : PostgreSQL 17.x
[+] Current role   : security_audit
[+] Superuser      : False
[+] Replication    : True

[!] PostgreSQL version requires security update
[!] REPLICATION privilege detected

[!] POTENTIALLY VULNERABLE
[!] Upgrade PostgreSQL to a fixed release.

SELECT
    rolname,
    rolsuper,
    rolreplication
FROM pg_roles
WHERE rolreplication = true;

14.24+
15.19+
16.15+
17.11+
18.6+

SELECT
    rolname,
    rolreplication
FROM pg_roles
WHERE rolreplication = true;

ALTER ROLE <role_name> NOREPLICATION;

SUPERUSER
REPLICATION
LOGIN
CREATEDB
CREATEROLE

if postgres_version_is_affected:
    if role_has_replication:
        if not role_is_superuser:
            report("POTENTIALLY VULNERABLE")
        else:
            report("AFFECTED VERSION - SUPERUSER CONTEXT")
    else:
        report("AFFECTED VERSION - REPLICATION NOT PRESENT")
else:
    report("NOT AFFECTED")

                    INTERNET
                       │
                       ▼
                ┌─────────────┐
                │   Firewall  │
                └──────┬──────┘
                       │
                       ▼
                ┌─────────────┐
                │ PostgreSQL  │
                │   Server    │
                └──────┬──────┘
                       │
             ┌─────────┴─────────┐
             ▼                   ▼
       Least Privilege       Monitoring
             │                   │
             ▼                   ▼
       Role Controls       SIEM / Alerts

┌───────────────────────────────────┐
│        Isolated Lab Network       │
│                                   │
│  ┌────────────┐   ┌────────────┐  │
│  │ Scanner    │──▶│ PostgreSQL │  │
│  │  Machine   │   │ Test Host  │  │
│  └────────────┘   └────────────┘  │
│                                   │
│       No Production Systems       │
└───────────────────────────────────┘