CVE-2026-16527Network attack vector

Remote code execution via unauthenticated metric writes

Published Jul 30, 2026 · Updated Jul 30, 2026

Missing authentication in PCP pmproxy on affected Red Hat Enterprise Linux releases allows remote attackers to overwrite PMDA metrics. The /store handler passes unauthenticated writes to pmStore; unreachable -S and -Q options and an unrestricted hostspec permit Unix-socket pmcd access that evades IP rules. The service must be running and reachable on TCP 44322 with pmcd active; code execution additionally requires the linux_sockets PMDA.

CVSS severity7.3
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in PCP pmproxy on affected Red Hat Enterprise Linux releases allows remote attackers to overwrite PMDA metrics. The /store handler passes unauthenticated writes to pmStore; unreachable -S and -Q options and an unrestricted hostspec permit Unix-socket pmcd access that evades IP rules. The service must be running and reachable on TCP 44322 with pmcd active; code execution additionally requires the linux_sockets PMDA.

The record

CVE
CVE-2026-16527
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-306, CWE-284, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 7Affected versions are unavailable in this record.
389 Directory Server · Red Hat OpenShift Container PlatformAffected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 9Affected versions are unavailable in this record.
389 Directory Server · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

7.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-284Improper Access Control
T1210Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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