CVE-2026-16527

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{"bugzilla": {"description": "PCP: PCP pmproxy: Unauthenticated access to /store endpoint allows bypassing pmcd access rules", "id": "2506031", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2506031"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L", "status": "draft"}, "details": ["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."], "mitigation": {"lang": "en:us", "value": "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."}, "name": "CVE-2026-16527", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "pcp", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-30T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-16527\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-16527"], "statement": "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.", "threat_severity": "Important"}

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