CVE-2026-16527Pcp: pcp pmproxy: unauthenticated access to /store endpoint allows bypassing pmcd access rules

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.59% · top 51% of all CVEs (13 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.3.

Affected products

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:7.0.3-5.el10_2 – < *

• Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

  • unaffected 0:6.3.7-1.el10_0.1 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:5.3.7-22.el8_10.5 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

  • unaffected 0:5.2.5-8.el8_4.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

  • unaffected 0:5.2.5-8.el8_4.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

  • unaffected 0:5.3.5-10.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

  • unaffected 0:5.3.5-10.el8_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service

  • unaffected 0:5.3.7-19.el8_8.1 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 0:5.3.7-19.el8_8.1 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:6.3.7-8.el9_8.4 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:6.0.1-8.el9_2.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

  • unaffected 0:6.2.0-5.el9_4.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support

  • unaffected 0:6.3.7-1.el9_6.1 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: unknown

• Red Hat · Red Hat Enterprise Linux 7

  All versions: unaffected

• Red Hat · Red Hat OpenShift Container Platform 4

  All versions: unaffected

• Red Hat · Red Hat OpenShift Container Platform 5

  All versions: unaffected

What to do

Workaround: 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.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2026-50976 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-16527](https://cveledger.app/badge/CVE-2026-16527.svg)](https://cveledger.app/cve/CVE-2026-16527)

Record last updated 4 Nov 2026, 22:09 UTC.