CloudNativePG is a platform designed to manage PostgreSQL databases within Kubernetes environments. Prior to 1.29.1 and 1.28.3, the CloudNativePG metrics exporter opens its PostgreSQL connection as the postgres superuser via the pod-local Unix socket, then demotes the session with SET ROLE pg_monitor. SET ROLE changes only current_user; session_user remains postgres. Any SQL expression evaluated inside the scrape session can invoke RESET ROLE to recover real superuser privileges, then use COPY ... TO PROGRAM to spawn an OS-level subprocess as the postgres user inside the primary pod. The READ ONLY transaction flag does not block this; it gates writes to database state, not external processes. This vulnerability is fixed in 1.29.1 and 1.28.3.
Metrics
Affected Vendors & Products
References
History
Fri, 29 May 2026 22:30:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Fri, 29 May 2026 16:00:00 +0000
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| First Time appeared |
Cloudnative-pg
Cloudnative-pg cloudnative-pg |
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| Vendors & Products |
Cloudnative-pg
Cloudnative-pg cloudnative-pg |
Thu, 28 May 2026 17:00:00 +0000
| Type | Values Removed | Values Added |
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| Description | CloudNativePG is a platform designed to manage PostgreSQL databases within Kubernetes environments. Prior to 1.29.1 and 1.28.3, the CloudNativePG metrics exporter opens its PostgreSQL connection as the postgres superuser via the pod-local Unix socket, then demotes the session with SET ROLE pg_monitor. SET ROLE changes only current_user; session_user remains postgres. Any SQL expression evaluated inside the scrape session can invoke RESET ROLE to recover real superuser privileges, then use COPY ... TO PROGRAM to spawn an OS-level subprocess as the postgres user inside the primary pod. The READ ONLY transaction flag does not block this; it gates writes to database state, not external processes. This vulnerability is fixed in 1.29.1 and 1.28.3. | |
| Title | CloudNativePG: Metrics exporter allows privilege escalation to PostgreSQL superuser and OS RCE | |
| Weaknesses | CWE-250 CWE-271 CWE-426 |
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| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-05-28T15:46:12.241Z
Updated: 2026-05-28T17:28:44.136Z
Reserved: 2026-05-06T17:18:51.782Z
Link: CVE-2026-44477
Updated: 2026-05-28T17:28:40.568Z
Status : Awaiting Analysis
Published: 2026-05-28T17:16:30.590
Modified: 2026-05-29T16:25:57.843
Link: CVE-2026-44477
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