High [CVE-2026-16527] PCP pmproxy: Unauthenticated access to /store endpoint allows bypassing pmcd access rules
This high-severity Red Hat Linux advisory covers CVE-2026-16527 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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.
Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). Weakness: CWE-306.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Red Hat lists Red Hat OpenShift Container Platform 4 as not affected.
Will not fix / out of support: Red Hat Enterprise Linux 6. Red Hat fixing advisory: RHSA-2026:55617, RHSA-2026:55560, RHSA-2026:55740.
Affected products named by the advisory: Red Hat package: pcp.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
- pcp-0:7.0.3-5.el10_2
- pcp-0:5.3.7-22.el8_10.5
- pcp-0:6.3.7-8.el9_8.4
- RHSA-2026:55617
- RHSA-2026:55560
- RHSA-2026:55740
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation checklist
- 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.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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