CVE-2026-6638 PUBLISHED

PostgreSQL REFRESH PUBLICATION allows SQL injection via table name

Assigner: PostgreSQL
Reserved: 19.04.2026 Published: 14.05.2026 Updated: 14.05.2026

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

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
CVSS Score: 3.7

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	Low
Privileges Required	Low	Integrity Impact	Low
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	n/a
Product	PostgreSQL
Versions	Default: unaffected affected from 18 to 18.4 (excl.) affected from 17 to 17.10 (excl.) affected from 16 to 16.14 (excl.)

Affected Configurations

victim has set origin=none on the subscription

Credits

The PostgreSQL project thanks Pavel Kohout, Aisle Research for reporting this problem.

References

https://www.postgresql.org/support/security/CVE-2026-6638/

Problem Types

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') CWE