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Advisory severityHigh7.3Red Hat Linux

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 10.0 Extended Update Support, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-16527 Source published Source updated

VulniPulse record published Record updated

CVE-2026-16527
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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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 10.0 Extended Update Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On; Red Hat Enterprise Linux 8.8 Telecommunications Update Service; Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; 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.

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 1 month ago·verify at source

Fixed versions
  • pcp-0:7.0.3-5.el10_2
  • pcp-0:6.3.7-1.el10_0.1
  • pcp-0:5.3.7-22.el8_10.5
  • pcp-0:5.2.5-8.el8_4.1
  • pcp-0:5.3.5-10.el8_6.1
  • pcp-0:5.3.7-19.el8_8.1
  • pcp-0:6.3.7-8.el9_8.4
  • pcp-0:6.0.1-8.el9_2.2
  • pcp-0:6.2.0-5.el9_4.2
  • pcp-0:6.3.7-1.el9_6.1
  • RHSA-2026:55617
  • RHSA-2026:72273
  • RHSA-2026:55560
  • RHSA-2026:74613
  • RHSA-2026:74612
  • RHSA-2026:73767
  • RHSA-2026:55740
  • RHSA-2026:72594
  • RHSA-2026:72593
  • RHSA-2026:72272

Official advisory · high-confidence parse· fetched 1 month ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • 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 1 month ago·verify at source

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