Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-30T00:00:00 PCP: PCP pmproxy: Unauthenticated access to /store endpoint allows bypassing pmcd access rules 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L CWE-306

An unauthenticated remote attacker can bypass access controls by sending crafted requests to the PCP pmproxy /store endpoint. This allows the attacker to overwrite any PMDA metric, leading to arbitrary code execution and system takeover.

An unauthenticated remote attacker can bypass access controls by sending crafted requests to the PCP pmproxy /store endpoint. This allows the attacker to overwrite any PMDA metric, leading to arbitrary code execution and system takeover.

This is an Important flaw in Performance Co-Pilot (PCP) `pmproxy` that allows an unauthenticated remote attacker to bypass `pmcd` access controls. By sending crafted requests to the `/store` endpoint, an attacker can write to any Performance Metrics Domain Agent (PMDA) metric, potentially leading to arbitrary code execution if `pmproxy` is running and reachable on its default port. To mitigate this issue, restrict network access to the pmproxy service (port 44322/TCP) to trusted hosts only using firewall rules. If pmproxy functionality is not required, disable the service. Disabling the service will prevent remote access to performance metrics via pmproxy. To disable the service, run: `sudo systemctl stop pmproxy` and `sudo systemctl disable pmproxy`. If firewalling, ensure to reload the firewall rules after making changes. Red Hat Enterprise Linux 10 Affected pcp Red Hat Enterprise Linux 6 Out of support scope pcp Red Hat Enterprise Linux 7 Affected pcp Red Hat Enterprise Linux 8 Affected pcp Red Hat Enterprise Linux 9 Affected pcp Red Hat OpenShift Container Platform 4 Not affected rhcos https://www.cve.org/CVERecord?id=CVE-2026-16527 https://nvd.nist.gov/vuln/detail/CVE-2026-16527