CRITICAL: CVE-2026-44477 (CVSS 9.9) — linuxfoundation cloudnativepg

CVE: CVE-2026-44477

CVSS: 9.9 (3.1) — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Severity: CRITICAL

Status: Critical advisory

Affected

• linuxfoundation cloudnativepg

Summary

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.

Verified Sources

• NVD entry
• GitHub Advisory
• MITRE

References

• https://github.com/cloudnative-pg/cloudnative-pg/pull/10576
• https://github.com/cloudnative-pg/cloudnative-pg/security/advisories/GHSA-423p-g724-fr39

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._