CVE-2026-16529Network attack vectorHinoki check available

Daemon denial of service via PDU overflow

Published Jul 30, 2026 · Updated Jul 30, 2026

Signed integer overflow in PCP on Red Hat Enterprise Linux 7 through 10 allows remote attackers to disable PCP daemons via crafted PDUs. In __pmGetPDU(), an extreme PDU length overflows the maxsize calculation to a negative value, causing every later __pmFindPDUBuf call to fail. Exploitation requires reachable pmlogger or SASL-enabled pmcd; both listeners bind to loopback by default, and the failure persists until daemon restart.

CVSS severity7.5
High
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Signed integer overflow in PCP on Red Hat Enterprise Linux 7 through 10 allows remote attackers to disable PCP daemons via crafted PDUs. In __pmGetPDU(), an extreme PDU length overflows the maxsize calculation to a negative value, causing every later __pmFindPDUBuf call to fail. Exploitation requires reachable pmlogger or SASL-enabled pmcd; both listeners bind to loopback by default, and the failure persists until daemon restart.

The record

CVE
CVE-2026-16529
Published
Jul 30, 2026
Updated
Jul 30, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-190, T1499.004
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

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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

7.5Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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-190Integer Overflow or Wraparound
T1499.004Application or System Exploitation

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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