Vulnerability in Cloudnative-Pg
CVE-2026-44477
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Cloudnative-Pg — versions < 1.28.3, >= 1.29.0, < 1.29.1
- Linuxfoundation Cloudnativepg
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-44477?
- CVE-2026-44477 is a critical-severity vulnerability in Cloudnative-Pg, classified under CWE-250. CVSS score: 9.9/10. Published 2026-05-28.
- How severe is CVE-2026-44477?
- Critical severity. CVSS v3 base score is 9.9 out of 10.