CVE-2026-44477

Aliases:GHSA-423p-g724-fr39
Received
Published: 28 May 2026, 15:46
Last modified:28 May 2026, 17:28

Vulnerability Summary

Overall Risk (default)
high
70/100
CVSS Score
9.4 CRITICAL
v4.0 (cve.org)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

28 May 2026, 15:46
Published
Vulnerability first disclosed
28 May 2026, 17:28
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v4.0•CRITICAL•Score: 9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  • v4.0•CRITICAL•Score: 9.4CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Techniques & Countermeasures

  • CWE-250•Execution with Unnecessary Privileges

    The product performs an operation at a privilege level that is higher than the minimum level required, which creates new weaknesses or amplifies the consequences of other weaknesses.

  • CWE-271•Privilege Dropping / Lowering Errors

    The product does not drop privileges before passing control of a resource to an actor that does not have those privileges.

  • CWE-426•Untrusted Search Path

    The product searches for critical resources using an externally-supplied search path that can point to resources that are not under the product's direct control.

Affected Systems

  • cloudnative-pg•cloudnative-pg

    < 1.28.3 | ≥ 1.29.0, < 1.29.1

  • github.com/cloudnative-pg•cloudnative-pg

    < 1.28.3 | ≥ 1.29.0, < 1.29.1

References (5)