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.
https://access.redhat.com/errata/RHSA-2026:55740
https://access.redhat.com/errata/RHSA-2026:55617
https://access.redhat.com/errata/RHSA-2026:55560
https://bugzilla.redhat.com/show_bug.cgi?id=2506031
https://access.redhat.com/security/cve/CVE-2026-16527
Source: Mitre, NVD
Published: 2026-07-30
Updated: 2026-08-18
Base Score: 7.8
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N
Severity: High
Base Score: 7.3
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS: 0.00392