Vulnerability · Published Sep 18, 2026 · Assigned by GitHub_M
CVE-2026-61821pg_partman authorization bypass to move child tables between schemas during retention
High 8.5
In plain English
A high-severity missing authorization in pg_partman from pgpartman. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
pg_partman is a PostgreSQL extension that manages partitioned tables by time or ID. Prior to 5.5.0, drop_partition_id() and drop_partition_time() use part_config.retention_schema as the target for ALTER TABLE SET SCHEMA and accept any nonempty schema name. A role with partman_user access can select a target schema where the role lacks the normal CREATE privilege, and the background worker performs the relocation with pg_partman_bgw.role privileges, which default to PostgreSQL superuser, bypassing the authorization check that a normal ALTER TABLE SET SCHEMA operation would enforce. This permits unauthorized relocation of retained child tables between schemas. This issue is fixed in version 5.5.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | pg-partman | no fix listed | DEBIAN-CVE-2026-61821 |
| Debian:13 | pg-partman | no fix listed | DEBIAN-CVE-2026-61821 |
| Debian:14 | pg-partman | 5.5.0-1 | DEBIAN-CVE-2026-61821 |
| Ubuntu:22.04:LTS | pg-partman | no fix listed | UBUNTU-CVE-2026-61821 |
| Ubuntu:24.04:LTS | pg-partman | no fix listed | UBUNTU-CVE-2026-61821 |
| Ubuntu:26.04:LTS | pg-partman | no fix listed | UBUNTU-CVE-2026-61821 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| pgpartman | pg_partman | < 5.5.0 |
Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N